Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe2418681f5b8d5…

MALICIOUS

PDF

77.3 KB Created: 2021-03-08 16:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4321f8e56df0d5470bb0a25892d5e8b SHA-1: 711466ac164a204795139bf09877775b04e6ed1c SHA-256: bfe2418681f5b8d513302a704c9fb741800d03b911cb9d555d654d636b8e5a4f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=words+that+start+with+sp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413361/normal_603af47ff03ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ff5a2787ad0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ff59c5926863.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/saying_to_remember_phases_of_the_moon.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/approximation_questions_ibps_po_2018uvx5j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5fcf039a6c0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6032be0664061.pdfIn PDF document text
    • http://guitar.su/nexamivojixejegafikc1x7l.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gcgfVIH/97772558024.pdfIn PDF document text
    • http://prazdnikprosto.ru/dezesanawigonetujuxifenikbv1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372072/normal_5fef368bab9d8.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/how_to_wear_a_surgical_mask_with_pleats.pdfIn PDF document text
    • http://genoray.pro/weight_watchers_scales_say_errenrsi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ffabe9a5ebba.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/jieGwhc/wuved.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/hghjnOc/getting_started_with_google_calendar_sync.pdfIn PDF document text
    • http://memisada.mygamesonline.org/how_to_find_the_mean_and_standard_deviation_of_a_sampling_distribution.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/gUb9Qjd/repost_for_instagram_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482208/normal_600b3a60f1f86.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/28c43b3a-f747-402d-9496-e6c4f6fba729/jerev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001ad305-f3c1-4c00-9f5c-800368a03191/how_to_find_probability_in_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa36f41-4bad-4432-a7ac-319836736565/sojurejubuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f0f89d-c0c3-4b73-9edb-45527e9201e0/zevitebel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92363b14-07ec-4887-83ac-671ef76df0d0/tekarajevugonigeleba.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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 5120 bytes
SHA-256: cbdd03644d8fb0f11ae7d1c0c7acd004d00d6f12a35c9383b64b4323248116b0
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10764 bytes
SHA-256: 66ff38a499f8c899bbe6912a95a287e7014d5c2b013d0e670457a7fd0579c120

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