Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34c6691c6251a67…

MALICIOUS

PDF

81.5 KB Created: 2021-05-21 09:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f522dde7e35b9cbd51c793d9e6157dc SHA-1: b99ebf63abec39ebe8053cbe56436974eb9f1994 SHA-256: f34c6691c6251a67fd0b3576d64341b53d6d91ff6347e07ca43f46e9db48973c
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that redirects to a site offering a game download, likely a lure to trick users into visiting a malicious domain. The PDF structure and embedded content suggest it's designed to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=euro+truck+simulator+2+multiplayer+indir+bedava
    • https://cdn-cms.f-static.net/uploads/4487431/normal_6041a9ef5d9cf.pdf
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/6251224.pdf
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5fca015e20472.pdf
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/3116383.pdf
    • https://cdn-cms.f-static.net/uploads/4380530/normal_604ab8e86fb64.pdf
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/nesavukonu-rekigetogojudet-zitiwuvib-tunarufaxiviva.pdf
    • https://cdn-cms.f-static.net/uploads/4476446/normal_602abb18101a3.pdf
    • https://cdn-cms.f-static.net/uploads/4378836/normal_602b59c419e41.pdf
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/bugufujipaxobovafur.pdf
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5fcac5f2222c5.pdf
    • https://sekekipozikevaw.weebly.com/uploads/1/3/3/9/133997985/57977817cc3.pdf
    • https://cdn-cms.f-static.net/uploads/4476453/normal_601629b9804c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wudibirewuduto/why_does_she_keep_disappearing.pdf
    • https://uploads.strikinglycdn.com/files/1c2556bb-dcf7-44ca-bf8f-58da8c0ffc02/descargar_cancion_de_ana_gabriel_mi_talisman.pdf
    • https://uploads.strikinglycdn.com/files/57e2a9b5-9054-42e8-9c15-2b24552e302e/31867836621.pdf
    • https://uploads.strikinglycdn.com/files/f764cd28-4803-41ea-8ace-babff708dad9/claim_evidence_and_reasoning_practice_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/pasawe/ps3_emulator_for_mac.pdf
    • https://s3.amazonaws.com/kefiperizonofu/bitdefender_internet_security_2018_offline_installer.pdf
    • https://uploads.strikinglycdn.com/files/28ae4a4e-30a9-4dae-a589-c57c1124bc16/how_to_workout_for_strength_endurance.pdf
    • https://uploads.strikinglycdn.com/files/e3ca243b-50cb-4a6b-bfdc-e83a18941669/what_is_chapter_1_of_the_giver_about.pdf
    • https://uploads.strikinglycdn.com/files/3e673497-ab6b-43f4-b819-ff46a51e745d/ruvorerowuxefubavuxotop.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_off00010067.bin
2205fb0355394231089c9bddf372b635d46d5d42ba4abe5f9c8f98129e00d10e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 5672 bytes
font_01_sfnt_off000113a8.bin
926ae06eb747a10d0fa461e695ad1423106d93e0babd7789433fd4b392ae36db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 10692 bytes

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