Malicious PDF — malware analysis report

Static analysis result for SHA-256 298c9c2be67d18f8…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 09:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e85e4c189c115d1c84ff5443685ba6bf SHA-1: 5657b41d71eb67ca48f87fee79a6eab3222d18b3 SHA-256: 298c9c2be67d18f842b3dca7c3e778cbaf2226509fa9db811f71044cdca277e6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://xezojetit.ru/wix?keyword=craigslist+pro+apk+free+download', indicates a potential lure for users seeking software downloads. No scripts were extracted, but the PDF structure itself is used to host these links.

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://xezojetit.ru/wix?keyword=craigslist+pro+apk+free+download PDF link annotation
    • https://cdn.sqhk.co/luwivimexu/YhhieYX/metogamerilafatizilika.pdfIn PDF document text
    • http://judejoz.iblogger.org/how_to_lose_fat_but_still_gain_muscle.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/ribijet_tanosowafa.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/1060275.pdfIn PDF document text
    • https://kafekejanabex.weebly.com/uploads/1/3/2/7/132740445/876388.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/xujevasofolevagen.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/jsxTkhr/munubosivomikamovemar.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/relimaganokozifevoz.pdfIn PDF document text
    • https://cdn.sqhk.co/borilokam/8hegfAL/figefodurezo.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/cifO8iY/xuvemamuxuvubev.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/9MHjeaA/closing_the_gap_performance_report_2018.pdfIn PDF document text
    • http://zedemotolezipa.22web.org/bruchrechnung_multiplikation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_b4a938ba589e4d2b96a2e58a2905b102.pdf?index=trueIn PDF document text
    • http://dalumawinalejat.epizy.com/fuvawotidosiwepalajodawa.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_893e81fd4b784dddb3a82f194df3b4fc.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_37a175a56d5142948c4f41fcd775fe67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/sas_72_comfort_letter_template.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_82dbb761ad2c4562b2edf942fec152c1.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_e60ca20cace44fe285283f86b4632660.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_f902ee63c2d942b0aad032d90b4a6ccf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/9211217800.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_dde8a8072af840b78537f338c0184738.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 5268 bytes
SHA-256: b6217db9a0e0b04f439366c862d1ae1661e4508e27aa6ad4e93d62b12cdfb812
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 2252 bytes
SHA-256: b3db8a6fbbed6d5ac0e1894cb9576a5c76ab27b90540713054de5b7abe901a07
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 10272 bytes
SHA-256: adb316395deb78f4cc2e46bea9f4b1a61a9f7179873eba52d1b38e29caf85f34
font_03_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 16120 bytes
SHA-256: d61de05247b0214b16833f92d38757e7791f684c14490fd752cf54ece9267098

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