Malicious PDF — malware analysis report

Static analysis result for SHA-256 decec9ffc8982028…

MALICIOUS

PDF

61.0 KB Created: 2020-11-26 07:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b8a88f38a0698a493508bf90223f9cb0 SHA-1: 9096483cba369d2ca532c2aaa0713f22a9a113e2 SHA-256: decec9ffc898202830b16c20e76da523fe2dbcd627435f1bdf242ba7aa9f9da2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with one directly pointing to a suspicious domain 'trafftec.ru'. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=brio+primo+isofix+manual PDF link annotation
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/modup_jajagil.pdfIn PDF document text
    • https://gubuxojigez.weebly.com/uploads/1/3/4/6/134650605/5490315.pdfIn PDF document text
    • https://tegawaniro.weebly.com/uploads/1/3/4/3/134330557/nagip-nozuxuw.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/9120565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_5fb7791e548a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5f98d2133ea84.pdfIn PDF document text
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/1735745.pdfIn PDF document text
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/lulotexale_labakumogow_xozumumuj.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/dukidanezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdbbb61-e0a7-4521-85b3-84e6aa1d3de1/nekumawalego.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/28615610294.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/23942025089.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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 5164 bytes
SHA-256: 9cf3e26604aff0901679e034980f602bb2ab81bbfd44a9cc67ecda6fed2ef4a6
font_01_sfnt_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 10088 bytes
SHA-256: 9b30fafae70d120981d4428146aeedc38d1aa48319485cd9c7449ae9a9d79eba

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