Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a159fe05b6a3d…

MALICIOUS

PDF

89.3 KB Created: 2021-02-13 21:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4a57d5a0264b888a4474bb7c33c0ccb2 SHA-1: 0bddf8d0ae7d441e4dd824cb648787df165d9564 SHA-256: fb2a159fe05b6a3d6b29cb8e907fce4a0b03cc13910ab8592e38ec03041a7207
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external PDF files hosted on disposable domains, likely as part of a phishing or malware distribution scheme. The embedded URLs and the document's deceptive content suggest an attempt to trick users into downloading further malicious content.

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://jacksth.ru/wix?keyword=day+trading+excel+spreadsheet+download+free PDF link annotation
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/0ebfa85b01fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458854/normal_5ff904548f899.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/GEgdgeS/42359779697.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/bYWtrhc/frantic_stamper_coupon_code_2020.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/7344111.pdfIn PDF document text
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/gefakevabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fcf20da43f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/cjgjgji/34317771559.pdfIn PDF document text
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/8469628.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/6889299.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jatu5jc/25862084468.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/hgdicgc/free_kicks_fifa_20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd82065b0f51.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/cxDv1ka/pictures_of_adventure_island_tampa.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://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_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 5464 bytes
SHA-256: c563550fb27aeea73b3f3793219db75d1939785ee21ab3b7ca684714bd655ad2
font_01_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 10208 bytes
SHA-256: 02616fa22f994f3a0758d010774263126f6529827dd89c3cbc19f168b8ef7b7d
font_02_sfnt_off0001497d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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