Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ac20e0b81f53b1…

MALICIOUS

PDF

92.3 KB Created: 2021-02-26 01:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3f3eef929931c48b4aaf41636cba4eb0 SHA-1: 22ab0ce04c468a682586135973624d1de8c176bc SHA-256: 83ac20e0b81f53b15e372a530a7fcb97d3848d850ea0ee118ab291e7ce82a55a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked sites. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=lotus+land+story+bad+apple PDF link annotation
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/ruvuropav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_602e0c4bdf6d0.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/mieQjfw/optical_illusions_gif_circle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5fed97aeb79c4.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/pevusuwoweronew_futalufazunobo.pdfIn PDF document text
    • http://mandarin-fruit.space/tetijojetevonw23c.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosinewok/TxF9geF/lingo_games_learn_spanish.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/50b1e8d51f.pdfIn PDF document text
    • https://cdn.sqhk.co/seruribemoju/ojagf3u/40713999048.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/ptjePaC/wobuguxolufozev.pdfIn PDF document text
    • http://return-0.com/slate_digital_vccs91mf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_6030daf308a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_601173480940d.pdfIn PDF document text
    • http://p-kavkaza.ru/mirujizeme1il7f.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/EsGujjO/assassin_s_creed_valhalla_gameplay_part_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5fcf311ce82b9.pdfIn PDF document text
    • http://stebsmeh.space/the_man_nobody_knows_summarydgvji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxurux.epizy.com/case_files_internal_medicine_6th_edition_free_download.pdfIn PDF document text
    • http://tuvugerij.rf.gd/senozosegutagawun.pdfIn 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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 15008 bytes
SHA-256: 6e1f7d1bb7416daadd61001065ea120f0f7a65a1bc375933ad058f1beed55ee6
font_01_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 5136 bytes
SHA-256: 64d16e7bebd1d3bb2bf9332849a98f6293f77deef5889ec7e62c6d9c1bf66e66
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 11104 bytes
SHA-256: 5136f5f49adcf8c73cee982ecf3b9d3a07b52199c688b6d4c8be6e2a1460ddf4
font_03_sfnt_off00014e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3B 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208