Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa17f0cad4aa629…

MALICIOUS

PDF

73.4 KB Created: 2021-01-10 19:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b94df7fdba15f7d11bd080259da46257 SHA-1: 0a6889beda6670154b4776f934754eda69901c7f SHA-256: 5fa17f0cad4aa629a1ef220afd8d139a63e0e91f0e3dfebab7f16ef132658539
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The document body, though heavily obfuscated, contains keywords related to video games and application downloads, likely serving as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafftec.ru/wb?keyword=star%20wars%20space%20battle%20video%20game PDF link annotation
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/bivudiw.pdfIn PDF document text
    • https://site-1200104.mozfiles.com/files/1200104/we_happy_restaurant_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fc76732820cd.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/doduwexap-lurug-vafagezixuwuw.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/gikepimebedunike.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/likee_app_owner.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/ggivELd/pong_party_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/ZjabZje/97977611605.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/987b21c6b.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/7336cf.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/tanikanaw/butcher_block_countertops_for_sale_wood.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 5788 bytes
SHA-256: d2437e8bdfc9d9d16abf0b250064c7565ef4df08192c1f26dd38ad26a4878aef
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 10852 bytes
SHA-256: 5a23edc1aaced9ee87a702fcbcf079fdf7a0fa780151ad64dc39c498649a222f

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