Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd29c0a708aa236d…

MALICIOUS

PDF

85.2 KB Created: 2021-03-13 18:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e2c19f4c7d0061ba2c159075fbc1bd SHA-1: 251c1a9bc887b9ab205c4447a58857af9c3d9599 SHA-256: fd29c0a708aa236dad0759a7f69facde1cda19ca3c9e487b607a3c2d85dd35b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one heuristic identifying it as a "PDF_SEO_LINK_FARM". The embedded content, though heavily obfuscated, suggests a lure related to a user manual, likely to disguise malicious intent. The presence of numerous external links indicates an attempt to redirect the user to potentially harmful content or exploit SEO techniques for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=bradley+smoker+user+manual
    • http://nizuvifoko.iblogger.org/davupugukovujujujorixu.pdf
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/nujez.pdf
    • http://vengriya.space/phd_student_cv_latex_templateeap0w.pdf
    • https://cdn-cms.f-static.net/uploads/4446635/normal_60342dd67acc1.pdf
    • http://7lessons.site/zagitevowupafufobogifvcxwq.pdf
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60265d08319d6.pdf
    • http://vukosam.22web.org/gilixusobekoxadot.pdf
    • http://jopkapopka.online/rajalapovudcy1ps.pdf
    • http://italywom.space/69343433798bf50d.pdf
    • https://static.s123-cdn-static.com/uploads/4402297/normal_5fe46ff3a9191.pdf
    • https://cdn-cms.f-static.net/uploads/4475861/normal_5fd869bdbdebd.pdf
    • https://mitafewojoruwe.weebly.com/uploads/1/3/1/3/131381680/8166a66d01b0cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sibovup.epizy.com/mechanical_advantage_of_simple_machines_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/44e6ad18-a3e0-4e6f-a604-e609cfd9a532/is_taco_bell_okay_to_eat_while_pregnant.pdf
    • http://tukudapig.epizy.com/bedatifunirakepajidosumiz.pdf
    • https://uploads.strikinglycdn.com/files/ec693727-aaf2-4df9-8661-442e39feb418/39795954669.pdf
    • http://bepalekene.rf.gd/xalozi.pdf
    • https://uploads.strikinglycdn.com/files/91becbce-a3a8-400c-a7a0-62fb332f3447/mirevuwuxawivozam.pdf
    • https://uploads.strikinglycdn.com/files/1bac5ad1-5004-4580-8783-d044774fa990/36603727514.pdf
    • https://uploads.strikinglycdn.com/files/57c85559-68f5-427f-bd11-40a810617985/what_song_has_the_most_spotify_streams.pdf
    • https://uploads.strikinglycdn.com/files/7d6ddf74-9a3c-4cf3-b2da-c1e73b9ccf21/ligisamasixujalidabijuf.pdf
    • https://uploads.strikinglycdn.com/files/d55b16fc-614e-4aa9-b78c-a7c183bc9edd/zatomasasawudowal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f3.bin
32166edede7f15899a79bf67a896c3c29b4d3a6fcd4978279f8c7bb9d02b680a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 4940 bytes
font_01_sfnt_off000113a1.bin
9996c77f407666360e2a980fd21b5b7de860aafe359556582317bf9c916c324d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 11124 bytes
font_02_sfnt_off00013980.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 4324 bytes

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