Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916e98706fae94c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 17:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: acd69f3e3e6866b24d37072c5ab5b86e SHA-1: ec0b544d954fe8b9829bb4d9354541782b79e9f6 SHA-256: 4916e98706fae94c9383eccabd2d6b78f203dfb268745e5ad0498b96c30669f1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a URL with a 'keyword' parameter indicates an attempt to drive traffic to specific content, potentially for phishing or malware distribution. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=computer+boot+process+steps+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388283/normal_6056741a2c61b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454304/normal_5ff3e8dcc9a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_5fc5c33641856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401558/normal_6000421a0de30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5fda1c9fe8a0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457862/normal_5fe2fb2accac8.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/4dxT5ji/90784238102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_605007239c853.pdfIn PDF document text
    • https://nezuvaju.weebly.com/uploads/1/3/0/9/130969963/tonegoperukulo_sizerejuweros_wubuziwamon.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/fokofaganino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_600d144823594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601309d014bfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd661976a6c1.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/basimegupe_ruvogewotaw_memakitigogova_jeganatebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_60174547d3d18.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/xikupesa-dafosebupusi-xedodisudemevo-legixi.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/76799498361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6030440887b06.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/WihYIsv/racing_fever_moto_hack_mod_apk_download.pdfIn PDF document text
    • https://nimawotamuxagop.weebly.com/uploads/1/3/1/6/131606149/xinufanedimironuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_600c5f974200c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_603f8c04a717f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tigagatu.atwebpages.com/laxifilujoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 4948 bytes
SHA-256: 14cb7abe645cdf6c9120e6f45571353a087ca30d4a3ec453c0ee3a210483d225
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 10172 bytes
SHA-256: b296fe4b25a82953224601fd5f530ca806b9e2884b6e8f99e350c52eb69f66d1
font_02_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f