Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53ebee9ba5c6c24…

MALICIOUS

PDF

83.4 KB Created: 2020-12-24 01:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4b29dddb628082e6f121b82603e6c09d SHA-1: 96fe64a209e0662f3a4065e059a6afe74b429a6f SHA-256: b53ebee9ba5c6c241f7495f0af747d884ae4f3ca6ebce839c846797908d39762
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it hosts a large number of external links. The ML classifier also strongly suggested maliciousness. These findings point to a phishing or link-farming attack pattern designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=angular+formgroup+validation+html In PDF document text
    • https://cdn.sqhk.co/sijoputolu/R7skYpn/wejugebukagapivan.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolosew/gbjgjh4/clash_of_clans_zombie_mod_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fa053c62de72.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/gfhcfke/slots_meaning_in_malayalam.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/rexikotipu_moziwovep.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/3013505.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/gg9giha/top_100_soul_hits_of_the_70_s.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/nerugiraxura/adobe_audition_1._5_crack_full.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/32801053086.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/94350011439.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/http_sciencespot_net_cells_and_organelles_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/72737910913.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/78340249139.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_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 5328 bytes
SHA-256: 29bc7cd79f943758da893ff3948bb5a28807a7d6a651164179362e2ee09c4333
font_01_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 12292 bytes
SHA-256: b4ef5c64ce459d60037c6026d555c76f69006a0697c0a546abfef8aea495f083

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