Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e91dc1340b3e88a…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 00:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 73ef16736d5239882e1b16478da21b2c SHA-1: ad065611df0d4233e809bce437384fe93f35418f SHA-256: 5e91dc1340b3e88a0e26af06276f9ffe62a63a9626b2cfc1d8ada360a8436555
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains, indicating a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's designed to appear as a document but redirects users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=noun+clauses+exercises+with+answers+pdf PDF link annotation
    • http://reweder.site/how_to_get_tivo_lifetime_subscription_for_free7ktcl.pdfIn PDF document text
    • http://semengergel.ru/cute_animals_cartoon_wallpaperv47xd.pdfIn PDF document text
    • http://all-gopro.com/a_brief_history_of_the_romans_2nd_edition_freepf24y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_604f26cc86274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_604863335d44e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6022d73d1ad76.pdfIn PDF document text
    • http://reawolt.online/42682725357y2kn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fdefc4c7532b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6019bc1de13e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_600fe5a4be489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366034/normal_60082cf0a2e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd0d9a2423e2.pdfIn PDF document text
    • http://pristav.pro/what_age_can_you_use_angelcare_bath_support2mzj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_6060931a8fda1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5ffbab2605b02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fefdfe782bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012de07931d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e4395f-5078-4e3b-8009-f6d24df0a39d/69270389395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9d2a51-de50-4a28-ad85-cfabd31a473e/lidesoxilaxolited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93c19b4-056e-449f-9224-d07bd9c1c22b/fofolite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436eef43-59be-48d6-b154-5e670abf9d66/27330800683.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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 5372 bytes
SHA-256: e5ed3c0fe0456253502f302a2d674e87ae51fe5349c09b55533b64d12a9c6b55
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 10932 bytes
SHA-256: b7df6acf4534f371b73ec70e49e7b4711ca4e736ba812706a3bb8c5087ff2a41

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