Malicious PDF — malware analysis report

Static analysis result for SHA-256 17811a0085727e44…

MALICIOUS

PDF

82.5 KB Created: 2021-02-21 06:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 115c9eac2e09c27415aae937a6e09705 SHA-1: 5be5b0d46a16090357cf98e6e35652291aca7d2b SHA-256: 17811a0085727e449106863ba1518a7396ada923593b12f3bd0441f933570ea4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or content-scraping operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL points to a site that appears to be part of this link farm, potentially serving as a lure or a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/wb?keyword=best%20buy%20sony%20xplod%20car%20stereo%20system PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375204/normal_5fd0308566597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_6010ac0518e40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5fe5017ba8998.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/vusukexowomoxunabax.pdfIn PDF document text
    • http://onenature.space/ceh_v10_certified_ethical_hacker_stu1ulim.pdfIn PDF document text
    • http://raffle.website/blank_baby_shower_bingo_cards75tl4.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/0a0adf5b14e9.pdfIn PDF document text
    • http://tophomework.space/dapagjf52j.pdfIn PDF document text
    • https://pikisavejalanab.weebly.com/uploads/1/3/3/9/133986241/6467464.pdfIn PDF document text
    • https://vizepojazitebag.weebly.com/uploads/1/3/4/1/134108988/2291268.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/juzewojavomofew/kogofojagoxosozivalotemif.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/vapirupoxurawagupowezogi.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/endocrinology_guidelines_thyroid.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/81336735330.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/lorutujuzajune.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/76809123318.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/photos_of_ashton_kutcher_and_his_twin_brother.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/samsung_j710fn_bootloader_file.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/reading_plus_answers_on_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/digimon_rearise_english_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/scientific_resume_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/cheaters_prayer_female_version.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_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 5576 bytes
SHA-256: 0b1fe44d17af769321f8e99cecfa63124ebbf6044f68e9f68f71e1580468e28d
font_01_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 10700 bytes
SHA-256: 17d3aa2347bd2c08b290e53cf4cc080cff7a0954fce017df43f10fd24b3bdbd0

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