Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f472e25173c712b…

MALICIOUS

PDF

77.0 KB Created: 2021-06-03 00:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c9351a44994cef0564d7bc237a7b5b4 SHA-1: cceb62ebf0aa618848363a3da0d3be1fe999c3bf SHA-256: 8f472e25173c712bb86faa4c65dc6644ba2a1955c227056ab87cfbafd0321a48
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic firings for PDF link farms confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=guild+wars+2+guide+classe PDF link annotation
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/dapufikinilelup_boredofem.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/8978540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fc623591e014.pdfIn PDF document text
    • https://surujesuf.weebly.com/uploads/1/3/4/7/134773125/xebizizovo_pinas_zapafegaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_6045bab407921.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/7208070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_600e0c4ce7d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd6114dcf173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_604c9a33ab592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_60145c3e1fec3.pdfIn PDF document text
    • https://lezisonesu.weebly.com/uploads/1/3/5/3/135339892/7610698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_6047916c0a605.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/pobogi.pdfIn PDF document text
    • https://lesesaxaxutetu.weebly.com/uploads/1/3/4/6/134613106/kodawidoxutuzev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5ff25de36e58f.pdfIn PDF document text
    • https://vupudirul.weebly.com/uploads/1/3/0/8/130874586/cb99d85157.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/2247250.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
    • 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_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 4948 bytes
SHA-256: a96f578badfca5a634c7460a9444dbba681b582e1d95c472b32c669cff14040a
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 10084 bytes
SHA-256: 2c8f5658875e8fadb3c67d33278fbccd4da88e9daeaf6f4da8fe44682c4166ac
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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