Malicious PDF — malware analysis report

Static analysis result for SHA-256 394780a7a024757e…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 17:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d9d89a2756add25edcffac58674db2b3 SHA-1: 39d42206a4e3d000a5575cd8c7df797c359bf97d SHA-256: 394780a7a024757e72a2cc00f1759bdae07f58b92878fa8fc5446fbd7acf60f5
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 likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with one prominent URL pointing to a keyword-related download. This suggests an attempt to direct users to potentially unwanted or malicious software, possibly disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/wix?keyword=twitter+vine+downloader+apk PDF link annotation
    • https://cdn.sqhk.co/wujakegu/fTMiijh/33544873797.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/cAjb47M/kexosemefakise.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/gfiaSV3/free_ringtones_wallpapers_for_minecraft.pdfIn PDF document text
    • http://clientesdkb.com/what_is_the_best_call_to_action_buttonm6eup.pdfIn PDF document text
    • http://goproonly.com/boropu3x0v.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/WA2ji3Q/4977149212.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/FjdjfiX/vepunuzitewesimamal.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/FjgJidL/driver_axioo_neon_clw.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/54444529629.pdfIn PDF document text
    • http://clipshd.design/fosoremumiwqkxw.pdfIn PDF document text
    • http://fc-aromat.ru/levizofevegoroe5glt.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/bawulejewitepivofu.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/j1iijf8/tamesibovalivukiru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_72279752ac3b4b6188338e5b9224183d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6494d675-bce9-4724-a937-e04d7fb5c213/sony_vegas_12_serial_number_and_activation_code.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_d7c6e240001b432babc7808b7a132688.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3ad085-1a71-4133-8653-e4f6c1f95645/rixobelisusizusi.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_75a85949bdfe44988809bcfe7d6a5783.pdf?index=trueIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/badminton_rules_in_marathi_file.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_222afb92aa1f4dc7b2825fcf3cfa6381.pdf?index=trueIn PDF document text
    • http://subogerilazelo.atwebpages.com/what_are_some_prompts_to_write_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace40c70-5678-4069-b5e6-20c957af1ca1/fapofitowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11039a5f-f7bd-4dc3-b5d6-3dc5498deff4/11488926142.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_a9e63560f21f4d8dbb254438c0d996e3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 4940 bytes
SHA-256: 59fc9ad2c2839edd6570702955993252b442a2148231675cbd05ad9634d97f75
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11644 bytes
SHA-256: e70583fa6eb6536c9b714862ad199dd28ce574beaf89ec336b2d5b8ae09e7db0
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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