Malicious PDF — malware analysis report

Static analysis result for SHA-256 8648003b3b27664e…

MALICIOUS

PDF

75.0 KB Created: 2020-12-27 09:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 497981397794e41a07f245228fb4be72 SHA-1: b14487ffa90419fb8708f1c9c94f185f54edbaf4 SHA-256: 8648003b3b27664e797a8f38e86c022ee5e1815ea88b69b289622fbb359bc960
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, forming a link farm hosted on disposable domains, which is a common technique for distributing malware or redirecting users to phishing sites. The document body, though heavily obfuscated, suggests a lure related to 'liquor inventory sheets'.

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://traffset.ru/aws?utm_term=weekly+liquor+inventory+sheet PDF link annotation
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/1564535.pdfIn PDF document text
    • https://bizalaso.weebly.com/uploads/1/3/4/4/134443832/gefenifani.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/imcggid/brickshooter_egypt_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/satovepato/Nii4ghd/luvexepebemupazixasipuw.pdfIn PDF document text
    • https://xuwotuzuzebim.weebly.com/uploads/1/3/4/6/134620597/7965113.pdfIn PDF document text
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/ralopegus-popap-tiroles-dujitiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fd133bbbcf04.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/1399207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f8c93eaceb8a.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/i48hjSq/zekojux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fdb0d323e0b8.pdfIn PDF document text
    • https://cdn.sqhk.co/buwepexe/KKlghCH/nick_mullens_stats_college.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/miraforovew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fe7d7df815bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 4928 bytes
SHA-256: df1934b449e4a6d3c02a88c8d94c2c8ff644a6d4231d55a3883d666010f847ae
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10368 bytes
SHA-256: 09a52dcac42c9a1456ba1dcb9b1d767cc717bcde12cf6f68e0782be078dc8f54

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