Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8c31882e3d6994…

MALICIOUS

PDF

77.5 KB Created: 2021-02-19 20:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 43381bf5daf85868d134a7731c3877ac SHA-1: 2e3161607d7c5ea7de2b19df461c8ec49826a408 SHA-256: 5b8c31882e3d6994d7369ee04f52c90aaa1dd45d4eeca2b16e948c75d72fa24f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document body's deceptive content support this assessment.

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=where+did+they+film+the+green+mile PDF link annotation
    • http://bufo.online/google_docs_spreadsheet_api_php0ckqy.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/mgftXYy/pofabogusurularozi.pdfIn PDF document text
    • http://itdiscounts.info/mixixefujtzj7.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/88gegcX/jikumaforeruwatepimu.pdfIn PDF document text
    • http://kulinar2020.site/chess_tactics_in_scandinavian_defense_qd6gitp0.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/vidafunebafabe.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/938309.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/5976770.pdfIn PDF document text
    • http://fortuneo-enligne.com/vedavizilamok5cz17.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/jfJXWij/angry_crab_tucson_health_code_violations.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/neGQzih/70s_rock_dance_music_playlist.pdfIn PDF document text
    • http://freshmind.net/advertising_definition_business_dictionaryzehuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugudupo.epizy.com/eyelash_extensions_aftercare_guide.pdfIn PDF document text
    • http://rakejobik.epizy.com/what_is_the_average_mans_arm_size.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_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 5048 bytes
SHA-256: 6dc510856eceec194a6ab13e96e14f2c3722dd3cd7657486ecc46bc6735d4e43
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 11828 bytes
SHA-256: f0c36e46d622890218535d98ac99f7426e20bfac8c9fbab1ae2e7bef2f02e439

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