Malicious PDF — malware analysis report

Static analysis result for SHA-256 8694d63f44d16c1b…

MALICIOUS

PDF

88.9 KB Created: 2021-02-23 18:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd5199c307f5819bc627cd5b70fdf253 SHA-1: 3d1a6452b4f952fe12811c132117a3c6bfd62c7b SHA-256: 8694d63f44d16c1ba97b707aa4a302aaba8be7dfe4437c12c938b8de87a541aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/123?utm_term=que+es+un+enfoque+educativo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501632/normal_601f58299a60d.pdfIn PDF document text
    • https://visorupa.weebly.com/uploads/1/3/5/3/135305290/wedefed.pdfIn PDF document text
    • https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/gepitejatudopoxulipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_6012ac91b31a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_601b3c5dbb11e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5ff633f8cae55.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/3b827.pdfIn PDF document text
    • http://fezelaradelemuj.22web.org/wojenelogujusum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fe7f2b1584a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_60280428bb294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejivexol.epizy.com/43426764050.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/70445460798.pdfIn PDF document text
    • http://jivurikevovuwud.epizy.com/master_budget_format.pdfIn PDF document text
    • http://jujonejetas.epizy.com/suvazeruwo.pdfIn PDF document text
    • http://xofawuriduk.epizy.com/jofikarobezugafunazug.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_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 5132 bytes
SHA-256: 3a844894c3bf41f73806b8e3653344cfbbfebd459e49df69edfb5bd84eb14020
font_01_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 12088 bytes
SHA-256: e2e20ebfe73ea33de6a0852e0c274440768e5906b0583438072ffec8c4724a99

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