Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c4d7182fc4474c…

MALICIOUS

PDF

72.4 KB Created: 2021-02-19 22:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 29a19bf0c48f44674c572e8093a5e247 SHA-1: 246c04c9de356097ee99cc4ca8d2b213edd45910 SHA-256: 37c4d7182fc4474c971f1ef0961cd9398e5d9d98495e951d3525e13c2eb8a9a6
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 0.9997

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://seumenha.ru/123?utm_term=thompson+center+hawken+peep+sight PDF link annotation
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/eb3e011e.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/tefonatulasoref_piwidalejiwok_dopujozuk_zujarunebokokar.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/sifilepem-pujusasix-naxogo-zepinitep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5fcce4b831597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_602c77502e6be.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/nudonigutiwu_jetote.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/6692729.pdfIn PDF document text
    • https://pinabufibofux.weebly.com/uploads/1/3/2/6/132682338/1312970.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/d4191f.pdfIn PDF document text
    • http://medgaj.com/oklahoma_cdl_practice_test_general_knowledgeklv8w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_602e2ded3598f.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/vesakivububig-gezuretudepivud-lulemozuja.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/mabodi_dodetiv.pdfIn PDF document text
    • http://submonster.xyz/60627108126qqi7u.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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 5420 bytes
SHA-256: 23f83e9c4a20c6f914a708960fb6e3519d919b77e7a85fd227263893365e56ed
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 11164 bytes
SHA-256: e90c3305bd9d5daffb76e8cbecb5df1ea449d3e117c6bf3d9e6943ac3deef184

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