Malicious PDF — malware analysis report

Static analysis result for SHA-256 7836266789874c9c…

MALICIOUS

PDF

57.0 KB Created: 2020-11-27 07:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e73a6aef16f4aae7cbcdbca45d1d684e SHA-1: d9bf7726472ceca6cf8fb210a16fa1ccd5c55b82 SHA-256: 7836266789874c9c70f2034b994d732f8dd96bda93368f87aa4605829040a79a
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a 'guide' lure, which is consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/strik?utm_term=radio+ready+guide+6+steps In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5fbc322440d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5fae6cb431e17.pdfIn PDF document text
    • https://zevenaxef.weebly.com/uploads/1/3/4/7/134745307/bodipikupisamu_kokagev_davodopulijinaw_gamizun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fc04fc94c15b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5f9985f6a3a1e.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/mipeboro/arduino_lcd_keypad_shield_code.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/botetagudemarejupud.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/net_framework_4._8_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/76395758792.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/dedenulokazififilokates.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/nusaxokudiwegukewodiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/format_factory_online_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/candidiasis_genital_en_hombres_tratamiento.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_off0000a844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA844 5360 bytes
SHA-256: 7966be58b727d33c4948df86606254fc683648e232ebc0ac07554f17d2408981
font_01_sfnt_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 8512 bytes
SHA-256: a551d1fb299b1f740731dc8a46eac59764af539fd19ee3c811688a8f7a1f27fa

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