Malicious PDF — malware analysis report

Static analysis result for SHA-256 92252aa6b5a9f338…

MALICIOUS

PDF

75.6 KB Created: 2021-02-21 04:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2effe21779c8d6ff86cf88bea4177f4f SHA-1: 55d88542c324ea591fc9107a0ccdcac606f926ca SHA-256: 92252aa6b5a9f33877b0de7b5f2326cb892a0a1231fc495bf165b080f1c178ed
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The document body, though heavily obfuscated, contains text suggesting a lure related to 'K9 mail f r android 10', likely intended to trick users into visiting malicious sites. The presence of numerous external URIs and link farm characteristics further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=k9+mail+f%25C3%25BCr+android+10 PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/z9jahiN/giradosizapunupoduwe.pdfIn PDF document text
    • http://lalewenesuku.22web.org/insulated_concrete_forms_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5fe8b55748913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_600c70b8c70a5.pdfIn PDF document text
    • http://sirosin.iblogger.org/pumabinusujugefomanidakew.pdfIn PDF document text
    • http://surevixa.22web.org/joyous_celebration_23_music.pdfIn PDF document text
    • http://fuviguz.22web.org/97958071392.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/ibbfgjP/27987252841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_60095bc4165b9.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/ekxgjjg/8602208917.pdfIn PDF document text
    • https://cdn.sqhk.co/merodobiweve/7daFhax/pay_my_entergy_bill_online_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/cbbK0zj/tigufizave.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/ehijAid/vevivemefin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_602e64a70857e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimomegujo.epizy.com/franz_kafka_best_short_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/nafimo.pdfIn PDF document text
    • http://zuxulabawiba.rf.gd/wipunutozozuxerupezijixe.pdfIn PDF document text
    • http://giduluterude.rf.gd/what_are_18_month_milestones.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/argonautica_orphica.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/88303470336.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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 5316 bytes
SHA-256: 5a770fe59e3646d273d1f3f6ff00065fbd07418d7582e817f183ffac093d3d5c
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 11476 bytes
SHA-256: 906f222da219b8a9f1a7c58223ee4b2673980f9b97ddd2c5c24483fd6a095de9

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