Malicious PDF — malware analysis report

Static analysis result for SHA-256 706d4e33d867b221…

MALICIOUS

PDF

71.1 KB Created: 2021-03-24 10:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01b9110f54b3b8df43ca13343ee3b355 SHA-1: a1e24b7ec799134c4b49113cae6ac6cfa9dea2b8 SHA-256: 706d4e33d867b221a0016370a97dfabc413fe45332dbf3354d44a32be4d4d9df
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery mechanism. While no scripts were explicitly extracted, the nature of the link farm and the high confidence scores point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=rails+guides+getting+started PDF link annotation
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/8273025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6014953006215.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/sofatilopeg-gajiveze-lamox.pdfIn PDF document text
    • https://pisisixiva.weebly.com/uploads/1/3/1/6/131636779/gefazeroxofuroli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_6023d5cc26b93.pdfIn PDF document text
    • https://kipopidetudi.weebly.com/uploads/1/3/1/4/131407440/1fb8ab99c8.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/casio_2688_gw-500a_manual.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/9975035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff8917fbd98d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_60364bb854af8.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/zebitakolope.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/buluxogekep_lulanufadur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_f9570fd76b67473bbc8a934ceeef4ba8.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_579a5f8686b848a099f98bdc5c68f83a.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_db8f8e2cd0bc4528a08f172033333580.pdf?index=trueIn PDF document text
    • http://dipagepe.atwebpages.com/minejexukiwipirel.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/amumu_guide_full_ap.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/hectic_teacher_sociology_summary_sheets.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_20147fbcbb1c4209b7a4af332861f84f.pdf?index=trueIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/malayala_manorama_epaper_today.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_60aaea3199064f8b983bb52535578896.pdf?index=trueIn 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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 5000 bytes
SHA-256: 21807236f97734e0828713c4db568b0adf5cfd0b87b8c89561e46c44de4959b3
font_01_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 11520 bytes
SHA-256: e85e9baf01fa92b9ec2a6b8cdff2c16d12f2a0f059d965bc14aec03de65140d1