Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb405e4a04269b7…

MALICIOUS

PDF

79.6 KB Created: 2021-04-22 00:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e88cb97d31f7b7a2d4579e8e4221b267 SHA-1: ee872d873a39677d010dfcf39b5c8bce2bb508f7 SHA-256: 1bb405e4a04269b7674840b873606299d81333292ad8a5ea8f295c00aaad8902
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to 'List of jane austen movies on netflix' and metadata from wkhtmltopdf, which is often used to generate PDF documents for SEO purposes. The presence of embedded URLs and the overall structure strongly suggest this file is designed to redirect users to potentially malicious or spammy websites.

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://bologen.ru/strik?utm_term=list+of+jane+austen+movies+on+netflix PDF link annotation
    • http://memisada.mygamesonline.org/levels_of_speaking_in_tongues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_606dc9e8c6f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_602c4bc86fe7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482215/normal_5ff13706f03ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fc672e503195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fc94046bc0fc.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/3722751.pdfIn PDF document text
    • https://bexukisutiso.weebly.com/uploads/1/3/0/8/130873741/2696813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_604051b928b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60531c309e8d4.pdfIn PDF document text
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/8825111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_6040a3a87328f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fd7184e34f8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fed5d9289aad.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/3463514871.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/75c2c38e-803d-49d7-aa22-7afc22f87219/38784054117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e50f694-2827-4c42-9fad-f4a8eecb06ef/sebidonuzexabodaxebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da42db94-ad6d-403e-be48-555ca54da233/how_to_change_my_beats_ear_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d574ee2c-bf49-4986-b3f2-218d635eb98c/wabogapaxoz.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_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 4964 bytes
SHA-256: 5aa636e60d0b29f0a64f857198a58548e22a435fba47c2e871ff93af0a8bfcb2
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 11000 bytes
SHA-256: 734c86c61a830687611e56af6452c5eb43ca4887bf41aa863352a810640cb72b