Malicious PDF — malware analysis report

Static analysis result for SHA-256 32170cf7629cce9b…

MALICIOUS

PDF

92.1 KB Created: 2021-03-16 04:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9482ba68c785b9d5c58880f61e734df9 SHA-1: bbbf060ee94732cfbaba881842e9a5be2d83d232 SHA-256: 32170cf7629cce9bc7f60f50397df47019f5d03d84cb98615310271a1ca9a8dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary URL points to a domain that appears to be part of a link farm. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious sites or for SEO abuse. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=charcoal+briquette+making+pdf
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/fijebuv.pdf
    • https://zapotaputilaka.weebly.com/uploads/1/3/2/6/132683001/16086.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/senodiw/allah_avalente_pennakane.pdf
    • https://uploads.strikinglycdn.com/files/5103d8eb-682b-415c-bb84-72a957a285e0/espanol_lecturas_primer_grado_1994.pdf.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_130efb9660a449ec83890374e8ddf22b.pdf?index=true
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_b80633b1953b4364bbfc356685937533.pdf?index=true
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_c34b8fa708ab4f86b752af004bb382ff.pdf?index=true
    • https://s3.amazonaws.com/kifutizijebuj/zuwidolumoxalujemasabites.pdf
    • https://uploads.strikinglycdn.com/files/22038076-5e62-4e40-9f9d-682af0d5458f/lekatez.pdf
    • https://s3.amazonaws.com/xoguwavosuje/the_beginner_s_guide_game.pdf
    • https://uploads.strikinglycdn.com/files/8805cd45-01ae-4360-9493-2d1485af68b9/why_wont_my_hp_screen_turn_on.pdf
    • https://s3.amazonaws.com/jikopot/xebitufero.pdf
    • https://uploads.strikinglycdn.com/files/015368eb-e656-4983-abb2-9a5c99b6011f/zuxiwo.pdf
    • https://uploads.strikinglycdn.com/files/e414dc30-88e3-4a50-b79f-f459f6b960f8/satomuwotolakipiwazaw.pdf
    • https://uploads.strikinglycdn.com/files/37c1f746-ab31-472f-82b1-11567641d56a/world_war_z_game_free_download.pdf
    • https://s3.amazonaws.com/foneniz/toro_electric_snow_blower_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/68c2fc6c-9d63-4a21-aa4b-5911bc26a7c7/how_to_cast_pure_flix.pdf
    • https://s3.amazonaws.com/lupebesu/durumerejo.pdf
    • https://s3.amazonaws.com/dejazuvorira/blue_tick_instagram_app.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_off00010d20.bin
c85601ae180f756bd4eb4400245c933203c58bac456f906c270f08ee34b2a12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 5628 bytes
font_01_sfnt_off00012008.bin
a26993c5d1b2b20d40f5c5f709d946b2d3fe38bf0dee1ce7186a1a207dc1b6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 12896 bytes
font_02_sfnt_off00014acc.bin
ae34b480cf5d8b97fba7ff5326021cf04f2af5053f908136309e53794eed31e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 16912 bytes

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