Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaae3e1b904612d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-24 03:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8ec503e3f1add62d278b4f504bc6447f SHA-1: 9512b7e9f80c59c55c9cd0eab5c036a6ac830943 SHA-256: 1aaae3e1b904612d1f582b9997bcc8615a5da73b3c000a34fda21590e9f312b0
186 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, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to disposable hosting services and redirectors. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging the embedded URLs for distribution.

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://jottigo.ru/strik?utm_term=can+i+take+neighbors+furniture+animal+crossing PDF link annotation
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/lofinozuxix_pujawuzixorowe_gelimeja_bumusosunogum.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/hfRmheP/tennessee_titans_schedule_2016.pdfIn PDF document text
    • https://dugumali.weebly.com/uploads/1/3/1/4/131437411/f5ac70ab97.pdfIn PDF document text
    • https://tabureribe.weebly.com/uploads/1/3/0/8/130813037/5527629.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/guhi2if/muzipow.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/rX4iaia/41796057951.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/xivuk_fajufumorudobej_roxisijaku.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/cjeajh9/boom_beach_wiki.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/zelerimajeb.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/e5ec58d.pdfIn PDF document text
    • https://susawodaf.weebly.com/uploads/1/3/2/8/132814942/zemumenu.pdfIn PDF document text
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/kuvumasotunera_lutaraxunupezu_xizekovogupo.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/hiigM2b/cross_the_road_electronics_pcm.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/average_speed_t_mobile_4g.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/ZiggfkW/wejinajajijo.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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 5404 bytes
SHA-256: 062b3a5c1b7801f72c1c6b18a5aed0fda08583844b6e6efbe65e0a51a0a4d9cf
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10196 bytes
SHA-256: 6e90ee74df82998845b0d9276b34b4bf30c4051085bc5455d5daed850f595178

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