Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f35b4a77b0f944d…

MALICIOUS

PDF

63.8 KB Created: 2021-02-10 00:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43fb9c69c859078d528d717c9eeda0ea SHA-1: 589e66f0e0fe8df2ba84b8884ca32298d8247be4 SHA-256: 7f35b4a77b0f944de0dd2db2cf7bb2aa43cf4a4f2a07e0ab38b0a3d4b7c207b2
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is designed to host many links on potentially untrustworthy sites. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wb?keyword=vcop%203d%20pyramid%20template PDF link annotation
    • https://cdn.sqhk.co/dejijadu/Ekhegdw/cara_menggunakan_messenger_for_whatsapp_webapp.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/jbhfaCW/grand_floridian_resort_and_spa_phone_number.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/dictionary_use_practice_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_6021e7d37634c.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/digomaxokewesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60223e990a3c6.pdfIn PDF document text
    • http://bomufofo.iblogger.org/28388408761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ffd142881fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5ff807e42d6b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420448/normal_600263f035535.pdfIn PDF document text
    • http://rawutunulodewo.iblogger.org/40445441778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://begalokatixatu.epizy.com/bikosimakigojud.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/dirumodavapi.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/fifa_19_france_squad_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/zavizivifamezivolexikezar.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/constant_of_proportionality_worksheet_free.pdfIn PDF document text
    • http://gewofudi.rf.gd/jesogimikujegeboxok.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_off0000bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF65 5272 bytes
SHA-256: 8aaabdaaad9ab82c3d83b4cfd51b8738e8972c46823d2e9ee186092487714b50
font_01_sfnt_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 9768 bytes
SHA-256: 77c439f34870bd43f87da77e5d4ed2f842605890b05cb4f193cf47b66c21145e

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