Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f98cb16bb55ff56…

MALICIOUS

PDF

78.1 KB Created: 2021-03-31 06:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 004d7233b934a09daf2fdb6f03bca1fe SHA-1: c9bec385ed57ceabd50dc4b567a2b435879ec362 SHA-256: 4f98cb16bb55ff565e6cea26dcda359d3946b43b84af9bb28e0f26e86bdaa12d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed to distribute SEO-poisoned content. It contains numerous external URLs pointing to other PDFs, likely to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=bearing+catalogue+pdf+skf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fcf9e1fbf33e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5fe3a86db1ada.pdfIn PDF document text
    • https://cdn.sqhk.co/dojagomudek/iRifZrG/university_of_toronto_application_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fda26774a7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_601f53f76dc88.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/hhicZgR/pianista_accompagnatore_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6034ee3aadb6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fe41da70dc89.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/is_cyberpunk_2077_exclusive_to_xbox.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/4222274.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/171WijI/25812390526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_60447999e4fb7.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/3364126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_60265a194ea56.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/effdd0ee7ae1.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/fenikixupewelevuwit.pdfIn PDF document text
    • https://cdn.sqhk.co/rizikodeni/gZXC3ZQ/20824186183.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/22371767542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5fea21f431f86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwelaloz.epizy.com/berichtsheft_ausbildung_vorlage.pdfIn PDF document text
    • http://vuvabideriwewet.epizy.com/bikofusepexodudumafinizo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5436 bytes
SHA-256: 321274b1d7b15a733e21ab762014af7741b92fbeb275bc7fa3f3b4d68505264a
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 9896 bytes
SHA-256: 3ca59af83bc381b54b6fd1d5e8c472f960b7a25ab1b62497d5bd445b40471254

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