Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabe82ab8476d348…

MALICIOUS

PDF

74.6 KB Created: 2020-12-23 22:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b051903c7bcf4a0cfdea9052dfa05402 SHA-1: 5bf4c5f7e61aac7bcac817cf6be436ad0b5ee729 SHA-256: aabe82ab8476d348a2982b0924459ac203d3596f59b7c2bf897fc3f96778bd46
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, many pointing to disposable domains and redirector infrastructure, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=space+shuttle+challenger+risk+management In PDF document text
    • https://cdn.sqhk.co/jegisizozul/EYxgiMB/sedirubiful.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/RM7b7DV/difference_between_barbershop_and_hair_salon.pdfIn PDF document text
    • https://paxudusumumo.weebly.com/uploads/1/3/4/3/134312151/zaloziluw.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/9753271.pdfIn PDF document text
    • https://xavuzilutose.weebly.com/uploads/1/3/1/0/131070872/ed579eab9b.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/tifatizep_bejuj_legaw_zutezivulis.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/X55wcid/leapfrog_games_online_south_africa.pdfIn PDF document text
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/verejumimifoxivid.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/wezedivafebiwad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/begijufadi/14685479683.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/acmarket_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/jikepuluwewojevufusabi.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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 5516 bytes
SHA-256: 8b0e3de2b1c30a35102fc9c7bddef415765a21fa6703cddc0c9ef4e8ba34ee7f
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10640 bytes
SHA-256: bc1b4cef26d322b0224c023af52d6ac42764e311fdb907d2d29956448e7f2bce

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