Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cac2498a769a40…

MALICIOUS

PDF

73.9 KB Created: 2020-12-21 21:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7d8359e96ca6c521284a49ba994120b4 SHA-1: bd2b1f3ca5803a71bd657e47ff7b901902adaff9 SHA-256: 41cac2498a769a4006269745e07baf9329cfc964aab667f5759075d9591473bb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to `trafficel.ru`, suggesting an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains text related to 'Jr ward lover eternal pdf', which appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafficel.ru/123?utm_term=jr+ward+lover+eternal+pdf PDF link annotation
    • https://nenizuve.weebly.com/uploads/1/3/4/6/134615173/luzalexulugelajat.pdfIn PDF document text
    • https://sugosagugijew.weebly.com/uploads/1/3/4/5/134584769/3237362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_5fa537c2f0c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f8c587b686d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fbea1cf4f39b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f88b8c32b86a.pdfIn PDF document text
    • https://kepupumi.weebly.com/uploads/1/3/4/6/134616340/pefetorepepop.pdfIn PDF document text
    • https://kezevamu.weebly.com/uploads/1/3/4/2/134266298/6640830.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/fuxubolamonadiwowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fa70ab5a7e16.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/81850.pdfIn PDF document text
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/8008952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_5fa9948a8deab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6b9d1c43b171198859c62/t/5fd1bca3071bbc688029ae78/1607580836357/paxoxeb.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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5000 bytes
SHA-256: 7cafe7442df51efbac3ff198e86f72dcc864ce29175114a48cea027b638352a3
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 10896 bytes
SHA-256: e42d6c00a4c8d0d4894d7dfec4aea38f04eca4db0ed999f9597903327719c774

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