Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4058fff937071d3…

MALICIOUS

PDF

74.3 KB Created: 2021-05-20 10:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9806dec27bfd5964a6eac52f2a14e13 SHA-1: a7be3f3fef1737c6e240d006820f4d48f1a1212d SHA-256: f4058fff937071d34a2b846fd6fe6464d75e58bb96dee96522195f9907dc114c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=iowa+test+pre+algebra+6th+grade+pdf
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/govotogun.pdf
    • https://cdn-cms.f-static.net/uploads/4460963/normal_604b80e3cb33c.pdf
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/minanepikaj-webejumo-xolidejove.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/391bfd6b0.pdf
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fd60e318c0f7.pdf
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/zazawibibivubawin.pdf
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/zovuvowokijisip.pdf
    • https://cdn-cms.f-static.net/uploads/4462775/normal_602940972a1a3.pdf
    • https://cdn-cms.f-static.net/uploads/4367674/normal_603e447bd57f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bodajaku/collins_cobuild_advanced_english_dictionary.pdf
    • https://s3.amazonaws.com/nitatotol/jifituvawajovosij.pdf
    • https://uploads.strikinglycdn.com/files/03d48a6c-cadd-4b44-8a01-cdea302fb573/wimemofumi.pdf
    • https://s3.amazonaws.com/jukezeluf/sulosisefafulobodenusivur.pdf
    • https://s3.amazonaws.com/tasufagijaremo/nasuvopuretiziz.pdf
    • https://s3.amazonaws.com/netinuwa/quotes_from_20_000_leagues_under_the_sea.pdf
    • https://s3.amazonaws.com/piwupevivotixi/android_install_apk_from_pc_adb.pdf
    • https://uploads.strikinglycdn.com/files/9d5116b0-eeb8-4e2c-a1d8-51d25f373018/gokil.pdf
    • https://s3.amazonaws.com/mejigavukolu/34258377270.pdf
    • https://s3.amazonaws.com/polojuliragam/81721491682.pdf
    • https://s3.amazonaws.com/fajonubinomeder/char_broil_air_fryer_turkey_time_chart.pdf
    • https://s3.amazonaws.com/gajabedafot/zajitigosajinus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin
d3ab6fa08bc7518cf5da76393ab5c2f79d7d299cc64c5d658bda5bdbc75d7263		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5628 bytes
font_01_sfnt_off0000f691.bin
1f2a5cfbab0343304ed8546bac2e3d52216a5c4bff427b50dcb99bef1c9dca8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10248 bytes

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