Malicious PDF — malware analysis report

Static analysis result for SHA-256 440417c3f8843aff…

MALICIOUS

PDF

67.2 KB Created: 2020-11-23 08:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 730d5d8b5d6a7ce225d44a3561a85215 SHA-1: 9f861f65090a43c9aa7eaecfe1faf5f0c5582ccc SHA-256: 440417c3f8843afffa3f08389ddee0e332e19697ac71ccbee9d1d6a796346937
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 SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be related to search terms, further supporting the lure of a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting 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://traffset.ru/123?utm_term=lana+del+rey+carmen+chords PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f874207e7056.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/jivemurajipu.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/232ffad13b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8b8ebe2c85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5f8e9140239ad.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_5fbad181ec2c4.pdfIn PDF document text
    • https://xixomizigif.weebly.com/uploads/1/3/4/7/134711715/ea689bd5.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/ba5cbac5.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/razuwabuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5fa1bd30c6aad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/521854a8-5463-4690-9e98-d41b49106ad3/nowexukuranowusirudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5337b8d6-e067-4fbd-b08f-7b9db5f5873f/love_and_logic_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 5220 bytes
SHA-256: 40655321e085db3d8d277b8e278f44706bd0c7a0f2781acce2e75c4e69bc851e
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 11064 bytes
SHA-256: 9d3f08efffe38f43a87070647b0746fe5e123d6e331517c9161179d9016850a6

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