Malicious PDF — malware analysis report

Static analysis result for SHA-256 93634eadb0df8ba8…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 14:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d2c2c172aeb7391d787ef63e194609ba SHA-1: 9cab49f9ac136e71afb294082af78625279d1c68 SHA-256: 93634eadb0df8ba8423aff7d0e49f0762b31a2dbc676f39621322352fe958261
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are flagged as suspicious or unknown. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm used for SEO poisoning or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The document body, though heavily obfuscated, appears to be a lure related to PDF software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=how+to+add+watermark+in+nuance+power+pdf+advanced PDF link annotation
    • http://legrand-spb.ru/dxcpl.exe_download_64_bitahzj5.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/dYpMJgj/83301770512.pdfIn PDF document text
    • http://itfamily.pro/bob_stewart_uniform_shop_bendigoadp99.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/4Qhcpn4/4519056437.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/hejbifB/dragon_fighting_snake_tattoo.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/6108005.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/fulupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosipive/acas_equality_and_diversity_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/50241611043.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/36894228268.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/afterlight_2_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/closers_misteltein_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/wugejapalijifu.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/list_of_adverbs_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/app_store_preview_video_guidelines.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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5268 bytes
SHA-256: 929f7837d8f33798604b051d2851681fada17b33e4df6fa88f80edc320a2c82e
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10432 bytes
SHA-256: 1a82ff75f106098139099e96d14f5466561db2eb327a3a193c293c60430c8e4e

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