Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8a2ca31b0f1293…

MALICIOUS

PDF

70.5 KB Created: 2021-03-25 07:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4fbf40bba44cbd3c04c48c7cb24d0581 SHA-1: 5636d8a6bcb1ffebf2012f33c5c86961dfb065e3 SHA-256: ae8a2ca31b0f12935b2326037d34166c2bcc891b69a7ad8f1859dc3eeb5ddd9e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://bologen.ru/strik?utm_term=how+long+would+it+take+to+count+to+500+million PDF link annotation
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/ea054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fca6dd180db7.pdfIn PDF document text
    • https://fozujivopaj.weebly.com/uploads/1/3/5/3/135303700/2250219.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/wulididofalo.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/440422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5fe8513c3f02f.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/9731819.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_18d4a8bf4dfe4a06ab402a6c75965c4f.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_57d70f050f854cdcb7142593dbaa9c65.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_e5e54a45778344f8944def397cbfe425.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/79818844184.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/what_causes_a_carburetor_to_run_rich.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_c095d09376c2490981f2aa48381e4907.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_b474a00f781044f9be1407dfae710bdc.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_ea11cd7ceea44e94bdf73c1a432a01e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/pudetadenobuledafoma.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_22438652ca9b463ea181f837651c5a7e.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_5c6ee706178f45e887fb8e4141f5c6bf.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 5368 bytes
SHA-256: 8a071422d878e4a4d2722f71a30855c44a1fd18a884e7ad827349b286471385d
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 11048 bytes
SHA-256: b566ac98fff68e959812d88570d95fdb97d493fdc80c8880d6ea119dee047a15

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