Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a4acad5eb72dae…

MALICIOUS

PDF

80.2 KB Created: 2021-03-31 04:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a265f488fea0e009548c498fc92f988d SHA-1: 1182f342e76fc091c1e2b9ab92c3cd0d9c2e1161 SHA-256: c5a4acad5eb72daea038b59317e186451ba34c0bea34a15bdc2c01cccf5a762a
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+is+knowledge+framework+in+tok PDF link annotation
    • http://lemiritafuwab.22web.org/platform_bed_queen_solid_wood.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_604b9e3f57f15.pdfIn PDF document text
    • http://instacopyrightcenter.com/ditonegamols2575.pdfIn PDF document text
    • http://podarokinsta365.site/10615146980l5sme.pdfIn PDF document text
    • http://giocodigital.fun/walmart_tv_antenna_outdoor6ib8g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479439/normal_5fe008e1dbe42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd1cbedb0c4d.pdfIn PDF document text
    • http://huseyincanx.com/74749391766d4lh2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60554905af5a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96370495-1e6a-4e88-b10c-22decaf83921/how_do_you_say_mandarin_orange_in_portuguese.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_4753819af6a645e684ed80f6ebee4d1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95434316-4333-485d-8879-9ba0dd201a3c/97276933610.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/surface_area_of_hemisphere_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/22031563669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc13d19-b642-40a1-98ee-0e301e8a434b/gulokuverazog.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_6f917d3f50ab44e3a63675ed138a28d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a7823e-ee59-4ad9-8de2-716be9a1fac0/41952041705.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/nozobasovuxe.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_8b967421f22d4dbba19196eabc0c20b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/909e657b-5752-411a-9902-5f7f6618262b/jovadogiramidefu.pdfIn PDF document text
    • http://wifepex.rf.gd/45134110644.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_e32cbf355dcb4dd5b8a30d53171caef6.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_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 5488 bytes
SHA-256: 51795c4e3f45146a19edf486c778dfe1c80481056d3f7c92ed5642526b9567ba
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10600 bytes
SHA-256: 45a1e21e632f92b0f28b1fdb232bce444f6c13953ac50e650d1e2293bc4e996d