Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace2d356554326ab…

MALICIOUS

PDF

111.2 KB Created: 2021-03-16 04:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 570cb39d9d2f365d99287d3d1aa18439 SHA-1: 0fab9f5e947a88de279990272cb4d2901540da6a SHA-256: ace2d356554326abd1b2a3fff84d3e86a56f078c196653e3f27aae6a0c6669ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://seumenha.ru/strik?utm_term=radio+shack+weather+radio+manual+20-315', is likely used to redirect users to malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=radio+shack+weather+radio+manual+20-315 PDF link annotation
    • https://cdn.sqhk.co/gabazumad/ianegjl/jamumeripovuzafabos.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/ganixe.pdfIn PDF document text
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/7c6abe3d5.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/cLbhfVR/dunusumajesajiji.pdfIn PDF document text
    • http://55571.ru/sex_magick_manifestingddrns.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/susoxidatejifilhnps.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/Shgijib/ankara_devlet_opera_ve_balesi_sahnesi.pdfIn PDF document text
    • https://degivuvexopuma.weebly.com/uploads/1/3/4/8/134858753/6408778.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/fbd27d6.pdfIn PDF document text
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/sedegixesuboxaxedom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_f2bc8bd3eb46499eae552d0d67be6f5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/karazomibonegusorozovekox.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_d75ddcb0e9804e3798f8d354fb243175.pdf?index=trueIn PDF document text
    • http://solezod.myartsonline.com/alphabet_arabe_littraire.pdfIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_cc415e4fcdac4214b9aa825b410667e2.pdf?index=trueIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_2c7ff107b8d2457c8900eec9f5f961c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somisilegex/labaxu.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/what_is_another_word_for_first_of_all.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/the_sparrow_book_plot.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_1492581c3efa4627b7779a2362272a9b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 3764 bytes
SHA-256: d589fe58303fd1c97edf26e1fd8eb4a71175d7c2e70161b86a5b85908d95b334
font_01_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 5988 bytes
SHA-256: b2a71134e212e7e063c909b0fee31e098488375352cca326f8543d31e06f26c5
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 20924 bytes
SHA-256: cd5480e95522fd875d8d5108a9b7aeb0482c7acc4fcdba07ecb3268d2405db65
font_03_sfnt_off00014a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A40 17812 bytes
SHA-256: 525ad137f7988b4365655c52c69ad3ba4850a2292478c0da0dbeffdd95f3cffb
font_04_sfnt_off00018457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18457 17480 bytes
SHA-256: d61b136f4d76987502f0c4c94121e7d300c021a8f142bd7775947b0f79d01999
font_05_sfnt_off00019e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7A 6160 bytes
SHA-256: 9f3297072e298734ab7ba776b89b8fc3caef0faf2b68cc00e2b494800fd2cac4

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