Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab7f79e87873bf…

MALICIOUS

PDF

66.6 KB Created: 2021-03-25 20:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 19ab30d1ad98f0211b87e6d245d21fb8 SHA-1: 0004419169720e20896cb82d8488a90dcd8f83af SHA-256: d1ab7f79e87873bf1c25b16fe5146017350b085fdc415ebb156195c6f4d09a86
242 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and are identified as a link farm. One critical heuristic indicates that a link within the PDF leads to known malicious redirector infrastructure. The ML classifier also flagged this PDF with a high probability of being malicious. The primary attack pattern involves luring users to malicious or suspicious external content through a dense network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9263

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=how+to+draw+a+rose+step+by+step+with+pencil+easy In PDF document text
    • http://freshnatur.fun/gekarerumuxotofamilxn283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_6038bdbe4aea0.pdfIn PDF document text
    • http://prizinsta.info/6031776927192l09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_600741ff95a10.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/ahmed_deedat_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ffa773a3de1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fe876504a933.pdfIn PDF document text
    • http://artrosil.xyz/67425044241q83b.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/7YQHhdK/93328536527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fec23875cb98.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/cihjbjj/fokikusigel.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/kiragojorinat.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/4ieTj0h/olvidarte_nunca_karaoke.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/1w9hbji/81741250721.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/centralization_and_decentralization_in_management.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_513bca8c5cce498b9dab65f688625f83.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_d9556fe8394a412991b6198f2667c773.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_78056924a79641bfa66ace3bc607c0eb.pdf?index=trueIn PDF document text
    • http://sifebitufol.onlinewebshop.net/harry_potter_book_online_purchase.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_814c8f180d0d4147a494a23eae74ec99.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_35653e3d0a3b4ac6afb502de0d9c657e.pdf?index=trueIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_231e251888ce4e368e4eb6fcd1bf91f2.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_b03ee9777b8f49bb886876af52b8b3ae.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 5244 bytes
SHA-256: 9ef0a12e443fdd5f6daaa9add298d3d31e2c713ed18de5c811e669a7b3968d57

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