Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a07a3170bf2e53…

MALICIOUS

PDF

88.1 KB Created: 2021-03-19 21:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dcfe6689107fd61b786966147075222 SHA-1: b806a889193a9842e0e55abad6b34678b57f1d8f SHA-256: e9a07a3170bf2e533fef10ec44c27178aea7c458411ea0dc2684cb07553108a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of SEO spam or phishing campaigns. While no scripts were directly extracted, the presence of numerous external URLs, including suspicious domains like 'midufefew.ru' and 'forexgeeks.net', suggests an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to English phrases and PDF metadata, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=frases+utiles+en+ingles+pdf
    • http://forexgeeks.net/coraline_book_englishtmpj6.pdf
    • https://cdn.sqhk.co/jimumakevaji/hyuc9ia/9855423537.pdf
    • https://cdn.sqhk.co/vuxijavapul/8njaChg/45995126854.pdf
    • https://cdn.sqhk.co/murafabu/ejjijif/soccer_penalty_kick_distance.pdf
    • http://gumelup.iblogger.org/minions_2015_subtitle_indonesia.pdf
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdf
    • http://bigops.fun/349383804tdblo.pdf
    • https://cdn.sqhk.co/pemenodisoda/Ahad9jh/slitherio_mods_play_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zunaduxa/american_heart_association_heart_failure_guidelines.pdf
    • https://s3.amazonaws.com/putelekireza/worksheet_on_collective_and_abstract_nouns.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_189205211fc74d65b4f63efd85b1a226.pdf?index=true
    • http://pewijaxenutudum.rf.gd/rujozoluzubokasaje.pdf
    • https://s3.amazonaws.com/vobuturinivi/google_play_store_app_android_install.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_0e96cf8cee994a45a9428286feeaaec1.pdf?index=true
    • http://bagomurugidapig.epizy.com/crazy_color_creatures.pdf
    • http://wivowutone.epizy.com/hanuman_vs_mahiravana_full_movie_720p.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f572.bin
e5f641b7fba2f90ef1ff465478b20641b224a23a7b72e5e9fa8bec51e6eedaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 4936 bytes
font_01_sfnt_off00010643.bin
5e8e1d26e86d3e2e7fe098fca2b02505106f00a95fbf27ef11d6665758ae9cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 11780 bytes
font_02_sfnt_off00012ce1.bin
425097674e90e8908c37fc26698ccec4f1481f172ceb44a17a852f828ec6304e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 16484 bytes
font_03_sfnt_off00014331.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14331 4324 bytes

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