Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bdac27c823673a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-02 08:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ba15fc1facbd77e6948b93347956c251 SHA-1: fdc70d01de050e0e177b7a6f6b073abe7b1623fe SHA-256: 71bdac27c823673a4b50cb96bb6a6521ef765218a5aa5d7aa24a90252a1a41fd
186 Risk Score

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 or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=ameritron+al-811+problems PDF link annotation
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/6882037.pdfIn PDF document text
    • https://sewemojokevapu.weebly.com/uploads/1/3/4/4/134463988/revusetabap.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/eAjitrR/74850175229.pdfIn PDF document text
    • https://nepuxobim.weebly.com/uploads/1/3/5/3/135304691/9a7d0.pdfIn PDF document text
    • https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/e31ddcd.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/oster_french_door_countertop_oven_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/8B0Yhjj/112978952.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/2015_honda_civic_touring_owners_manual.pdfIn PDF document text
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/aea389a.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jagfiag/karaoke_sing_songs_apk.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/wupajinopomujowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipemoluligera.myartsonline.com/70509653203.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/comcast_remote_codes_for_samsung.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5372 bytes
SHA-256: 89e62c032edb7e5f798f2e14fde21d9ddc6800b6905a5ca3c42998668276c646
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10376 bytes
SHA-256: 3075e29ab70de9ca67e49eaadb37b1179a0a37185191b977ada1454b17076d74

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