Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fa013c4b6d946e…

MALICIOUS

PDF

75.4 KB Created: 2021-05-23 01:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f04f3445b57406eca1e51286b085bedb SHA-1: 2837438adfeeefbefcc26ec84f5b0bc457f260c4 SHA-256: a0fa013c4b6d946e4a0d8b6d458b79869f4975a6bfa6687c46b48e62be7bd09d
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+give+an+eye+chart+exam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6024326c20983.pdfIn PDF document text
    • https://nixalimug.weebly.com/uploads/1/3/2/6/132680811/7061267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_6048ee2f3be4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5fea25411cd42.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/dijep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5ff2fa3998722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_602c0eb83466a.pdfIn PDF document text
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/sobaxezasetudoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5ff5486286f1a.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/1d11043462d4de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_606660aff3ef3.pdfIn PDF document text
    • https://jejenami.weebly.com/uploads/1/3/4/6/134684972/7ed17d1fe813.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/toxifo-mugekope.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/rorives/89026137244.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/98985798250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3696dbd3-9109-4e3b-867d-01ee8431bf57/87734420527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b35d412-b30f-4abd-a218-66ee41444948/short_love_poems_for_wife_birthday.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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 5076 bytes
SHA-256: 5aeed9531e01e1abb9ffcc14e563cc13cd2077a7f0166a9290c67bb77190f605
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 10668 bytes
SHA-256: 66ef0eec531fb8501e603a4a7e98e6a659b94ad371ed10500592ce3827e6f8fb
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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