Malicious PDF — malware analysis report

Static analysis result for SHA-256 5254704ae2bc30e5…

MALICIOUS

PDF

83.4 KB Created: 2021-03-30 02:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa5146ab178fc292be3062bdc63333a SHA-1: 9d3d247a29e832fdc375a94ef2468811f25c479f SHA-256: 5254704ae2bc30e5821497be16380399133608f239e31d6316c9cf7330af846e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. Several of these links point to potentially malicious domains, suggesting an attempt to drive traffic to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

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://bologen.ru/wix?keyword=osceola+county+warranty+deed+search
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/kisovukusegabepab.pdf
    • http://megalit-korolev.ru/salter_kitchen_scales_1021_manuall5ifg.pdf
    • https://regisaralox.weebly.com/uploads/1/3/2/6/132681556/ponelapipu_susenagef_nobevezasoz_vawoxitowamif.pdf
    • https://cdn-cms.f-static.net/uploads/4383695/normal_604ef0bbcd468.pdf
    • https://cdn-cms.f-static.net/uploads/4417644/normal_6011ee73997c9.pdf
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/088a7.pdf
    • http://ketadiets.site/can_someone_fall_back_in_love_with_you_againyes8o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gosete/mativutevosegupajapis.pdf
    • https://uploads.strikinglycdn.com/files/7c9bdea4-d1a2-4147-a0c3-771df8b9ea68/how_to_design_home_interior_online.pdf
    • https://s3.amazonaws.com/tumuzu/best_front_bookshelf_speakers_for_home_theater.pdf
    • https://s3.amazonaws.com/sefepugolupalax/php_array_to_json_formatter.pdf
    • https://uploads.strikinglycdn.com/files/06dedfae-007a-4bda-a09c-e836a532ec11/are_blood_elves_good_warriors.pdf
    • https://uploads.strikinglycdn.com/files/bdb98d9d-51df-4591-9a0a-32c2fa3cfe58/tanobibixexonenawefevox.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/pearson_igcse_biology_textbook_answers.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_off0000fc77.bin
127ee6a4d436e5dfb458b23ab21e14f297b01993aba8a1e330c5ff391f1c5e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 5080 bytes
font_01_sfnt_off00010dc1.bin
55917040600de1f79e3dc0d444b9e5f1bb775d049d8efbdd3b5830022ec99b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 10304 bytes
font_02_sfnt_off000130fe.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 4324 bytes

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