Malicious PDF — malware analysis report

Static analysis result for SHA-256 16858ae0bf0c08d9…

MALICIOUS

PDF

71.5 KB Created: 2021-02-19 10:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d04ccb29c5ecba8e622ea49b635b8155 SHA-1: 32941299b5f0db2df4ce810b9eea2b5465373e8c SHA-256: 16858ae0bf0c08d9a1c15f01e7688b79e6ea8c5ceb5e3f903c7fb09789ce10f9
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious redirection and potential exploitation.

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://jottigo.ru/123?utm_term=how+to+draw+dc+comics+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459320/normal_602f127384e65.pdfIn PDF document text
    • http://siondez.ru/19004565703l5ld4.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/iajbojb/37776431208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fc7b58f24983.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/lFjghvB/sulebojon.pdfIn PDF document text
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/sezakidilaw.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/B5fnsgj/13558363532.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/9953762.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/cijhehb/loliri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5ff21705e45aa.pdfIn PDF document text
    • http://digerutejonoju.22web.org/67216139802.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/vanilla_wow_rogue_guide_oto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448727/normal_5ff78042d81dd.pdfIn PDF document text
    • http://alkim.xyz/at_t_secure_family_coste7b7b.pdfIn PDF document text
    • http://philonio.online/crossword_answers_today_wsj9w9lb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 5308 bytes
SHA-256: 105adad25fc93ad8d1a0ca5a7289ade41d9d4db01092da038fb1812e84d2c7dd
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10360 bytes
SHA-256: 715b02a71beaa3983a8161d2c789522478ae48bf0c83b23d60efd155db5b3c5f

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