Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83f03af9ffe65ae…

MALICIOUS

PDF

72.0 KB Created: 2021-01-06 00:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4eee1cccca9f29dc85692faca276bc5f SHA-1: 95976e4370a3da7f08c28040ed0afca1970ba054 SHA-256: c83f03af9ffe65ae36d2ea637c37f6b9763051ce59260f549c9d7b6014e5fd85
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs, particularly the one related to 'informatica mdm administrator interview questions', are likely lures to direct the user to a malicious site, possibly for phishing or malware download.

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 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.
  • 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://trafffe.ru/123?utm_term=informatica+mdm+administrator+interview+questions PDF link annotation
    • https://cdn.sqhk.co/ravawiku/yLrii9e/brazil_football_world_cup_mascot.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/ctaOhjI/best_new_alien_invasion_books.pdfIn PDF document text
    • https://duxepanakotijek.weebly.com/uploads/1/3/4/3/134340233/lowadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fab6f007b388.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ihhdPhi/call_break_multiplayer_card_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fc1d4aa7c90f.pdfIn PDF document text
    • https://cdn.sqhk.co/daribugubive/R3gdhaH/56482849918.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/dezajok/67399543204.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/antropoloji_anadolu_niversitesi.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/boxiximepawovagexe.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/vesikadababerukelufen.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/vudazevobipeze.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/86431178172.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/honkai_impact_3_reroll_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/diltiazem_er_dosage_forms.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5352 bytes
SHA-256: 9fe878783145059874cd2fdc72d0f8ad8af603d9756090d356a6d07cd5d24605
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10564 bytes
SHA-256: 7491921af957dcadea3748707cd80fd97ff71ce4b9e3c587c1d053ca8f17c5c2

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