Malicious PDF — malware analysis report

Static analysis result for SHA-256 f764d46d27f5a08c…

MALICIOUS

PDF

80.7 KB Created: 2021-04-02 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57aa07db5df6cb6f05b095354b9466ec SHA-1: d5894ce3056aa8be6f4b13a9814b10ef46031dbe SHA-256: f764d46d27f5a08c8d099a91ab289d8dd47619ab13232b013dc981bfb8a6865c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. The embedded links likely lead to malicious websites designed to phish credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=traxxas+summit+1%252F16+parts
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/646b9e27586ff.pdf
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/xefakilezu_nosowuxowuripi_dogijesug_ruxiful.pdf
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5ffaa97da38ca.pdf
    • http://mavavuvew.22web.org/rutakisavezebu.pdf
    • https://cdn-cms.f-static.net/uploads/4456391/normal_6052d64ce32cb.pdf
    • http://wasukowoko.iblogger.org/armour_of_god_movie_song.pdf
    • https://cdn.sqhk.co/sezunofubuzi/E7jdjhN/maximum_tip_calculator_in_python.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/befajozajereliv_pasimogijajoxak_jufomufizowogo.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_6052b75a7551f.pdf
    • https://cdn.sqhk.co/bamewimoxatu/vsjgEkS/10092786296.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozoxub/bs_player_formats.pdf
    • https://s3.amazonaws.com/kawotexulozax/tozadojulepasepim.pdf
    • https://s3.amazonaws.com/nakuzafol/94175770262.pdf
    • https://s3.amazonaws.com/genijusemu/wiwamotugubutetobewu.pdf
    • https://s3.amazonaws.com/gimufesajo/3760611866.pdf
    • http://lidesesepaz.rf.gd/xegupitegodinatematenur.pdf
    • https://s3.amazonaws.com/navoburarovada/3856808237.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e983.bin
f9c2a08a5714b9b651f3d6a54456bb8b95b7c59c81a3e9b1aff16cd9f428258b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 5192 bytes
font_01_sfnt_off0000fb21.bin
78163b2c5b247bff8a77416baf679e1bed53b6888c96eff946852bba5b69aedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 11060 bytes
font_02_sfnt_off000120fb.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16060 bytes

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