Malicious PDF — malware analysis report

Static analysis result for SHA-256 213498c298f5e6a4…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 21:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6e8daa096a3a947f5d383de645b8b1e7 SHA-1: 36af297c692e25d9186e19010e2ac9c863c412da SHA-256: 213498c298f5e6a4fd47e2689f729ceaa58170703a367febb400d12396f841f5
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on disposable domains, indicative of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/wix?keyword=beaver+county+pa+recorder+of+deeds+online+search PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374002/normal_601f0cc75ccfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5fcc7efb7e49a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_602f9b5686235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_600b568978a1a.pdfIn PDF document text
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/jituv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5fff703f0530c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fe7a2e70cb3f.pdfIn PDF document text
    • https://jujavaxoziwes.weebly.com/uploads/1/3/4/1/134108829/depozikagusodu-fibugifigijos-pobevilikeko.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/379cf13ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5fd791df51690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_60512138b7f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_5fd8df529b3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_6012fb20c2311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffb15dd92f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5ff215f7ede76.pdfIn PDF document text
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/bugepagagumugew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_6008f7860efcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_602513ac1c3fa.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/ca38904c-4639-4aff-a290-786ef29deb88/47759196295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f2fe91-7cb2-4064-906c-5954fc3e8778/tapagisip.pdfIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_439488daa1da4def9acaabb3a383f437.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_a6d0843e404c436aa654106900d9e0f0.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_df723d20a32048e2aee0b377b0af3e71.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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5452 bytes
SHA-256: 247ac6e73d564c306cc275614ee9cf8f6520d1938d0a28e672fb751eaf26dfea
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 11164 bytes
SHA-256: af07e3b67470a0cd12462e1ea4133853841af9bb5829159a557b8d02dd83ddb1