Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef4f456aa119cb2…

MALICIOUS

PDF

70.9 KB Created: 2020-12-03 14:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d756f973327d953abe453e52163e1c29 SHA-1: d0f9500d67e3466d875a535d553018068bb870f4 SHA-256: 6ef4f456aa119cb22dd44a25de55b281ae4342b5b94741a293258776d1f4d26c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://traffnew.ru/123?utm_term=the+big+book+of+nlp+expanded+350%252B+techniques+pdf+download
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/wapiw-dirawematudeso.pdf
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/4352435.pdf
    • https://sobaxijuxoje.weebly.com/uploads/1/3/4/2/134235367/67d4401de5ceb.pdf
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/010daddff.pdf
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/ninazefet.pdf
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/xipudutogeluzuzunare.pdf
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/sufuv.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kujim_wafij_gekiliwad.pdf
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/robeda.pdf
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/8493026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0f05df9866f3fd2d48fd4/t/5fc2b5dacb3e0f5771a94102/1606596060639/94840265654.pdf
    • https://static1.squarespace.com/static/5fc10620bf71053ccb10dd13/t/5fc1cc2564571256547edd6b/1606536229953/62399886938.pdf
    • https://uploads.strikinglycdn.com/files/6a249214-66a2-4f21-8f74-f2812c85ef37/31175595869.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59c.bin
5ba52a1d40af33f9c99f9244726ca87085e265d0669868852dfc965dd50c5625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 6188 bytes
font_01_sfnt_off0000eaba.bin
94bd5b53aa1a4ea65ae844db9cb739e851cd8c04f4aa24aedcc6d38c7c97c6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 9884 bytes

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