Malicious PDF — malware analysis report

Static analysis result for SHA-256 0062a8584cbdca4b…

MALICIOUS

PDF

70.7 KB Created: 2021-02-26 17:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 34baf9dd6b495e5e7e3ee8913380b564 SHA-1: b5d32bcb84212e8c0b2874e0ebc3835bdc1cfc57 SHA-256: 0062a8584cbdca4bd355fedd2117ecc74ef9652129336449f50ebeef2d1d251b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with one specifically identified as a link farm designed to redirect users to potentially malicious content, disguised as a dictionary app. The presence of embedded URLs and the overall structure suggest an attempt to direct users to external resources for further compromise.

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
  • 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://crophysi.ru/strik?utm_term=spanish+english+dictionary+app+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5fef9671b88ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_6034039ba0722.pdfIn PDF document text
    • http://ipoteka.net/saffire_pro_40_connection_problemsvvwv3.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/ijSKhft/crunchyroll_premium_not_working.pdfIn PDF document text
    • http://thelandofbadideas.com/149776701584e70l.pdfIn PDF document text
    • http://medupaj.iblogger.org/20774626386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fce46d7616c5.pdfIn PDF document text
    • http://avto-trokot.xyz/amalina_malaysia_songonykv.pdfIn PDF document text
    • http://golosa-spasibo.ru/bomewokawewuk6f6wz.pdfIn PDF document text
    • http://senteber.site/patadakemofobazezijomhitb.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/ibU6Kgh/fallout_shelter_mr_handy_not_collecting_caps.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/dihmjid/8923731925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zejibanunepi.myartsonline.com/56213704659.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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 5620 bytes
SHA-256: bf13dbd60568ae37e14ae7944c85646fda95b1def7084aaaa09abbc4bbccfdca
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 10412 bytes
SHA-256: 0b4da8ad90f7d1630486f541a6da0f6aa831c72c452aaa2f25298af9734996ce

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