Malicious PDF — malware analysis report

Static analysis result for SHA-256 9127e9d95f3cbb84…

MALICIOUS

PDF

94.1 KB Created: 2021-01-12 05:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7e40f214f807c9806d33583fe6748456 SHA-1: b44b44c332d3b2dc6ae286aaa8a4ae524be51881 SHA-256: 9127e9d95f3cbb84fed3ebc776945674ccede11f3fb9bf1edce8bd54bf822c85
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffking.ru/123?utm_term=mardens+brewer+jobs PDF link annotation
    • https://site-1172743.mozfiles.com/files/1172743/hydraulic_calculation_for_fire_protection_system.pdfIn PDF document text
    • https://site-1172367.mozfiles.com/files/1172367/boreziguzilorebebitoju.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/xujakatezutizesal.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/jopeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fcbcbcee0348.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/wevuno.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/kogolalozaroj_sezepidole_kiwekolo.pdfIn PDF document text
    • https://wojagezut.weebly.com/uploads/1/3/0/7/130775605/dee414011774e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fa93098013fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fde91f118e19.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/jujupum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fa0512a1d5bb.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/haNcu31/gimajazijubuditetuvij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 5100 bytes
SHA-256: 77fd98a6cf3bd7e22d116ad83b3c5c273d6b228c168044e6381c8809b012a1bb
font_01_sfnt_off000144e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 11492 bytes
SHA-256: 7138059e3d65700b1593692d43f82b5cebd21d07a4aae1915b104ed184d04c2e

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