Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aaca9eb0b22d74…

MALICIOUS

PDF

72.8 KB Created: 2021-03-16 15:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e019b5286936e2349421dbb2965b88f6 SHA-1: 93ee95e32632d7e83456fdbef16fd38fe7624687 SHA-256: a6aaca9eb0b22d742c4f602d0c54a210474e865d0007d8a6423457c0c78bd454
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=game+maker+resources PDF link annotation
    • http://hq-cleartv.info/hummingbird_fish_finders_side_imaging_reviewsfuvz0.pdfIn PDF document text
    • https://lofofofudu.weebly.com/uploads/1/3/4/6/134621951/bimebagamafi_pulasuzipinil_ruvibivoxesuz.pdfIn PDF document text
    • http://testrun.ru/american_megatrends_bios_5.13_manualm6rgz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60251b97c55ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_603a5019e50e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fe937b7c7e76.pdfIn PDF document text
    • http://macsk.space/all_excel_formulas_with_examplestysns.pdfIn PDF document text
    • https://wavinibavuma.weebly.com/uploads/1/3/1/3/131398010/xivavobibazi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_6001833a0f128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_c3ed0bc641814e0d9f71d465fbf94b11.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_bd085302e7854171a5125fbc5fabcab2.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_0a6f92d5b80147e6bb834d5a14a762ec.pdf?index=trueIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_fee244c7075e4e329057d50aade17000.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_9be9a4b18f674bec90b1a84577172629.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_475cf16509c943b3aec4b698599f51e9.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_5c017e9166d04641b76e193a7b472ea0.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_d2597e4da8b64f799b4e5052e54f9126.pdf?index=trueIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_b6f5f679607a4b1e8de92adb777bc7ca.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_6d54bde961554bd2b0f7d634af774c2c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 5008 bytes
SHA-256: a34444ebae8230115e4ac8206bde58a3b9f384d4324c1fd5dbe31b01041e4006
font_01_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 10880 bytes
SHA-256: ae7f1b838accb34de3436e011f7ad4a34fb5ee6964383f1c1ff339767fec1384