Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a6f91c1d9466b4…

MALICIOUS

PDF

77.7 KB Created: 2021-02-23 12:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21ad75c9681a428f803f3b314d7e2726 SHA-1: 1fcb6dca690e3e73a49f44edf6d50ba21b5cc265 SHA-256: 13a6f91c1d9466b46ad0cb4d279e5c5df3698f3185be26c592129b40739aa84b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=where%20is%20the%20best%20place%20to%20buy%20a%20riding%20lawn%20mower PDF link annotation
    • https://cdn.sqhk.co/suxujaba/gtVi4s1/identity_verification_pua_earnings_verification.pdfIn PDF document text
    • http://perevod-card2card24.site/calories_in_bubble_tea_with_popping_bubblessu31h.pdfIn PDF document text
    • https://cdn.sqhk.co/momebuman/4Jqkngg/lorixitowogub.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/Uhhq81U/zedemulesinuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_600addfb71a85.pdfIn PDF document text
    • http://elerctum.org/865613871488t3tg.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/JhiFEgd/am_word_family_videos.pdfIn PDF document text
    • http://semengergel.ru/roxewoletinilogiguwamh7ibu.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuduwedimu/2yhdZha/78567974830.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/fcidsL0/bawozodufizon.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/29d871aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexofiz.epizy.com/waxanibodoletakuligikuleb.pdfIn PDF document text
    • http://tikokowekujuw.epizy.com/wivulenasurematim.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/2279924657.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_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 5832 bytes
SHA-256: 83c4a8123837c6d2356acf2ca1ae3b1a4927975aa4c54278a3d57b471fe6aa53
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10104 bytes
SHA-256: 3efb55a352660a6766f5b303449d3b255fe810137e56b1b6bcc843eb2b475d79

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