Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5b188a108ea204…

MALICIOUS

PDF

73.4 KB Created: 2021-02-21 16:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99622b20e219b821ac299cda32c0e864 SHA-1: 1e7152d8cf11040c7356dbb104c533e8f567594e SHA-256: af5b188a108ea204396346c093904dd7e3ca7133b3f4375c304070088031bb1d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs under the guise of providing information about heat exchanger repair. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging JavaScript for obfuscation or redirection.

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://leonvi.ru/123?utm_term=how+much+to+repair+a+heat+exchanger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471514/normal_60310683d3f88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_601a46ba4dd88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60256e37a3fc8.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/catecismo_de_la_iglesia_catolica_vaticano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_600e3dcf5a5d0.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/zuvanavawuk-gadexewovirajap.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/8129046.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/dowonunorev.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/5ef6bb22b1a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5ff5d9e8a8850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60129d785eb55.pdfIn PDF document text
    • http://viwumurowiwoba.22web.org/chert_rock_history_of_formation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kagokonutuvep.epizy.com/zilinisozusalejo.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/masterarbeit_informatik_anforderungsanalyse.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 5140 bytes
SHA-256: 85e006d0f47a62ccb816775adc5b9277b2944661e71b98fab679f12791537040
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 10436 bytes
SHA-256: a3596a3af8b2578de7ceed6efb1dbe5aff4269a54098766ff800da4f59a2d972
font_02_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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