Malicious PDF — malware analysis report

Static analysis result for SHA-256 279778a326f69bd9…

MALICIOUS

PDF

74.0 KB Created: 2021-02-26 03:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 60ae53a07873ae7688485cc3592c056c SHA-1: 7ca4995ee6f1f5f91c604a7a836b5797dc60990b SHA-256: 279778a326f69bd9648d21e02ce77f9b62804368968649d22b201d3d87c68445
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+become+a+real+kid+spy PDF link annotation
    • https://cdn.sqhk.co/gabotewobe/jjkhieb/metaphysical_poet_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/gichiFT/ruxaxul.pdfIn PDF document text
    • https://xotototovizeta.weebly.com/uploads/1/3/2/3/132303406/feketobok.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/jiigiat/super_mario_run_hack_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pajelidul/b6v6iJH/clash_of_clans_attack_strategy_th9_farming.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/cijhhgc/pewdiepie_bridge_video.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/ibhdgeq/zidirusilexalej.pdfIn PDF document text
    • https://cdn.sqhk.co/gigepiwej/h6QMjds/navatavidatavagi.pdfIn PDF document text
    • https://sokotomajav.weebly.com/uploads/1/3/4/0/134040389/5654498.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/jodepu-zonoseboke-noramanoz.pdfIn PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/9420098bc36d5a.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/rimepusox/77352154259.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/the_5_levels_of_leadership_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/experienced_teacher_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/appvn_apk_update_version.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/java_code_image_from_url.pdfIn PDF document text
    • http://zapesuxeliribi.rf.gd/rigofezirifikizivolonora.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/20645500756.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/kinumesefowagefad.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5580 bytes
SHA-256: a5464c7d785abea3cd822d52d34ebcbba764f715b9fc2f7d1d170ecc4d1790bf
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 10284 bytes
SHA-256: 6d552fcc1fe2277ec544f2ef7837b83d13083e046a7f9128c4829dee3142516d

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