Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe1b4e925111750…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 08:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc66b368db4173468817f290f423219a SHA-1: b1b9b992e9ca38e06ca5667cb47f13d9ae099892 SHA-256: dfe1b4e9251117502fed90a2dc7d4318798e4a3958d26aec1bce3c084a86f421
96 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, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'xajibur.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://xajibur.ru/wix?keyword=the+death+of+common+sense+pdf
    • http://golden-bridge.pro/81623450825duebz.pdf
    • https://cdn.sqhk.co/rifusofuwedi/iHjjhdo/dental_assistant_chairside_procedures.pdf
    • https://cdn.sqhk.co/nozesinipi/tgcegdB/50950405447.pdf
    • http://onlajn-kassa.ru/play_literary_devices2n6xe.pdf
    • https://static.s123-cdn-static.com/uploads/4365583/normal_600556aa87ae9.pdf
    • http://inglassrus.ru/summary_of_martina_the_beautiful_cockroachs7s3g.pdf
    • https://cdn.sqhk.co/zaperarori/w9Njfjg/77286291457.pdf
    • https://cdn.sqhk.co/fagevibe/6pggGxC/dutarazuzajex.pdf
    • https://cdn.sqhk.co/taxodisilif/Aigjhbb/tepawipaxabigididebuvebu.pdf
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6004b21cbfd60.pdf
    • https://static.s123-cdn-static.com/uploads/4393647/normal_5ff76e58cd72b.pdf
    • http://strgb2.ru/xibajetubo3mm8e.pdf
    • http://purpless.vip/lazonulamoje1p46z.pdf
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fe153c4b25e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b6dc4d15-7ae5-4689-81bb-888260f31bde/weposexuxedirulezotogi.pdf
    • https://s3.amazonaws.com/xupovobejanam/best_drum_rudiments_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/55e3c5e4-9361-4ea7-bd04-b00ea49de693/linear_algebra_done_right_solutions_chegg.pdf
    • https://uploads.strikinglycdn.com/files/f91caa86-38c3-41fc-861d-e91a7ab995b1/96653570321.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/what_are_the_different_types_of_islam.pdf
    • https://s3.amazonaws.com/nufidibodudulad/conditional_formatting_google_sheets_script.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_7f40fb4f6f3c4c1985aaca653bac75bc.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_d663307abef74d1fa64a340fa4117015.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_d8989dd940b248209583a8aac7c1d678.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c25fc80d-8f89-494f-b53b-f97eecf85864/garmin_astro_320_updates_software.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_off0000f687.bin
900db91079342e937e68454069089fa55adb4fbb3affef5c80930d754cc7f5ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5216 bytes
font_01_sfnt_off0001082a.bin
177924cb910eab07d0e8125ce4ab1a4f94036646bf30a12db143061a34697f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10660 bytes

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