Malicious PDF — malware analysis report

Static analysis result for SHA-256 724446c1dadf93ff…

MALICIOUS

PDF

95.8 KB Created: 2021-02-27 23:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9a5b6cb76ac67d133106d6eb4b101b60 SHA-1: 5672f126506c59c46ded4654a48eecf79b4fe30e SHA-256: 724446c1dadf93ffe25fab074451316d1867c60b218dde017c278d613b0452e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://xezojetit.ru/wix?keyword=displacer+beast+5e+roll20 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ffd5f8e94ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_603819e9d7278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5fd99199c22fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_5fd9af99d10cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_602d42a399490.pdfIn PDF document text
    • http://tapabafana.22web.org/nigepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405650/normal_6001f179c581e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5ff9aa3d6df06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5ff33d0b1e3b4.pdfIn PDF document text
    • http://sesopob.iblogger.org/sheets_for_ingenuity_bassinet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_601960cf37d4d.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/dunanajudixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_6000b35d26a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_6034415f31ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_60001185f201d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sisaxu/reported_cases_of_zika_in_fiji.pdfIn PDF document text
    • http://bexadujozopu.epizy.com/72466078464.pdfIn PDF document text
    • http://jidoreno.epizy.com/viwibodomejof.pdfIn PDF document text
    • http://notaruk.rf.gd/uniden_bearcat_bc350a_specs.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 5144 bytes
SHA-256: cd3f85a9012d1e2ba06deedc234564a82659280dd1f3019b7c4c49b8e8f35d97
font_01_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 10580 bytes
SHA-256: 792e1ff8754d190621bb43a27d8189b604597c1e4ed4572c69d42a6f21a9c6bd
font_02_sfnt_off0001638a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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