Malicious PDF — malware analysis report

Static analysis result for SHA-256 60041eab8f90d1e7…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 21:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 805bd52257716759caa75829d13ac257 SHA-1: 7fe91d9468aa3a10c55f4353c83bc5623f4335d3 SHA-256: 60041eab8f90d1e79e75719f5e1afa36f860d7c4c48b23d97e763aecc09a5d0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to drive traffic to malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=07+chevy+impala+ss+engine
    • http://italy-small.space/alan_wake_fulldqzvr.pdf
    • https://zewekoli.weebly.com/uploads/1/3/5/9/135966642/146e96b40ddd.pdf
    • http://avto-trokot.xyz/does_a_trane_xl824_thermostat_have_batteriesrvbgk.pdf
    • http://lnstagramoriginal.com/attack_on_titan_season_4_episode_6_full_episode_crunchyrolld98jc.pdf
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/dokurane.pdf
    • http://salonhq.xyz/reinforced_concrete_slab_on_grade_design_calculations4iwgh.pdf
    • http://kdghy.online/hanuman_song_dj_mixml9ll.pdf
    • http://nonly.xyz/gordon_leishman_principles_of_helicopter_aerodynamics5v4yr.pdf
    • http://tronreserve.online/lg_refrigerator_repair_guides9skj.pdf
    • http://brosbass.com/wolfcamp_shale_formationttd32.pdf
    • http://minuette.me/what_is_letter_of_inquiry_in_businessxjjop.pdf
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/penetewo_tuzam_wokogodanu_tafopekeburafa.pdf
    • http://7lessons.space/99936553852vw81r.pdf
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/wekab.pdf
    • http://startbastar.online/50838644394c7n89.pdf
    • https://safibumiwi.weebly.com/uploads/1/3/4/3/134320627/gazusuwetizarug.pdf
    • http://milanomoda-italy.website/benoit_mandelbrotkpm81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xezonijida/84850772736.pdf
    • https://s3.amazonaws.com/lebaxa/kidifudavejoxesudap.pdf
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_2fd64736511d42cc83ae04c1ba0f2df2.pdf?index=true
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_c1a5ee19abc04794ae81d456e18445cd.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_5678b6ebb1ab4a8cb10e40e2b1e281a9.pdf?index=true
    • 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_off00010b00.bin
4f9c3f6e3b2085459fab08ad72dd1e4d489c6d695f90185569dc114510795a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 5540 bytes
font_01_sfnt_off00011dc9.bin
6624ef72c156d246925d100cb008f17899f9b83a4b93af27b0fdb8596de0bcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 10888 bytes

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