Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ae891941c71da9…

MALICIOUS

PDF

173.6 KB Created: 2021-03-01 21:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d0c42b87548fcb926c56a6a1bfa76773 SHA-1: f5e4f50dd64dea792dea59bfb978a80dd4390394 SHA-256: a8ae891941c71da91f7d4d6543b50fb706528a1d6079317faa560c89b81aa2e0
126 Risk Score

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. It contains numerous embedded links, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm hosted on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=%25D0%25BC%25D0%25BE%25D1%258F+%25D0%25BF%25D1%2580%25D0%25B5%25D0%25BA%25D1%2580%25D0%25B0%25D1%2581%25D0%25BD%25D0%25B0%25D1%258F+%25D0%25BD%25D1%258F%25D0%25BD%25D1%258F+%25D0%25B0%25D0%25BA%25D1%2582%25D0%25B5%25D1%2580%25D1%258B PDF link annotation
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/fikob-lipofijobewej-belulopegano-sudeged.pdfIn PDF document text
    • http://nat-yoga.space/943601252146283w.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/rapel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_60212b9b1cf1d.pdfIn PDF document text
    • http://lunesygets.xyz/91057481549myzp4.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/little_alchemy_guide_to_make_humanihgoi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5ffcbb70844de.pdfIn PDF document text
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/2902944.pdfIn PDF document text
    • http://pycnidwzxc.info/bumusagazojoabcqu.pdfIn PDF document text
    • http://my-favshope.online/50034523126pcr73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446915/normal_600902953f3b0.pdfIn PDF document text
    • https://wodarobasuk.weebly.com/uploads/1/3/5/3/135300597/7001885.pdfIn PDF document text
    • http://dressnbuy.com/86685983364xzi3e.pdfIn PDF document text
    • http://reduslim-ordina.site/battery_tender_waterproof_800_istruzioni41g9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423732/normal_5ffad33d897b7.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_off00025fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FB3 5292 bytes
SHA-256: 8e561f8d746fba66f26b172d760360b57a458e7799839aa7ad201c0c241255ae
font_01_sfnt_off0002714a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2714A 16784 bytes
SHA-256: b81da2e9474f748ea310c3bcf04b53b0a54c749efc3be9b7b9340aea5538d02e

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