Malicious PDF — malware analysis report

Static analysis result for SHA-256 812a79e01b143bea…

MALICIOUS

PDF

94.0 KB Created: 2021-05-25 13:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 16d3856c3b73ce4d46f8a1122aa571bd SHA-1: 90899cbcddc27c8028767f3a98b45fe6817f1268 SHA-256: 812a79e01b143beacc4c61b1089f1a4f74cf09a82a483f0e7aa640b68386b639
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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/strik?utm_term=what+greek+gods+are+not+married PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391314/normal_602d648b37b64.pdfIn PDF document text
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/9af6d628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6063616db1b01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450148/normal_5fc95459733a4.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/sewulogopafaz-ramomuwuma-rofivufirerid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fdf589ed0f49.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/8a7444fd.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/7510669.pdfIn PDF document text
    • https://fipupoluvov.weebly.com/uploads/1/3/0/7/130775710/6301462.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/didemetepizizinawat.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/922090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_605ee8b1722ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_606181dc7c1c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fec5c9b230d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fdc433b7096e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_6016284f9e208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_6003639bc37fc.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://uploads.strikinglycdn.com/files/fa0976c0-ae22-4804-b008-cbeb9b64f44b/storage_networking_fundamentals_cisco_press.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9158b6-d09c-4d5b-9f88-cdb587c6ed4d/what_would_cause_a_washing_machine_not_to_spin_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7688c4a-47cc-44e1-98f9-ed8f55032283/23554640834.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_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 5072 bytes
SHA-256: 058f64fe7bb572431256d03baba539ff22a2d844e0ca6161b897592ea4c0e93a
font_01_sfnt_off000138e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E6 10448 bytes
SHA-256: a0acf84e28401ce3be734c51378153851bef649c0a010c798aeec2df3d93c498
font_02_sfnt_off00015c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C75 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e