Malicious PDF — malware analysis report

Static analysis result for SHA-256 505ba0ff58b6e240…

MALICIOUS

PDF

82.6 KB Created: 2021-04-15 02:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 60e09e5550c9439101c51400e31f61a9 SHA-1: 5873ab38cb405d9b39127d2c1f184f674172564e SHA-256: 505ba0ff58b6e240f19eda7b2ce67643312f120fd264ed53d8bfd88413732c57
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=dell+precision+t7400+ram+configuration PDF link annotation
    • https://xulexina.weebly.com/uploads/1/3/1/3/131398260/349078.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/5508475.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/3ba07ee.pdfIn PDF document text
    • https://maxojemuv.weebly.com/uploads/1/3/4/2/134266220/6523230.pdfIn PDF document text
    • http://dumazuzutone.22web.org/xonek.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/wamixakizamorulanopi.pdfIn PDF document text
    • http://fexavakagejil.iblogger.org/1097528168.pdfIn PDF document text
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/d9305b.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/1157b22fa84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zufojadibi/98905948915.pdfIn PDF document text
    • http://jelasojeb.rf.gd/bibefoxuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484e12ab-a61e-4192-a34e-5a7378f31f94/80640712197.pdfIn PDF document text
    • http://jusaketij.rf.gd/crosley_record_player_cd_recorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b96d07-1e69-4dd8-b357-c2029a9bd7fd/how_to_make_frozen_wings_in_air_fryer.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/tanarifogivoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f3639b-a103-4b89-8073-24a6af4e7fd6/which_word_best_describes_the_tone_of_the_poem_above_brainly.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/60280323261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319a1058-a2dd-422c-8f66-cd6fd28222e4/how_to_change_home_on_google_maps_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/excel_home_finance_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1407273-804a-4f62-ab89-26a9d061ff25/fifty_shades_of_freed_bahasa_indonesia_free_download_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d04cb5-8ae0-41e7-80ae-25933fb34ed0/2927755797.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 5524 bytes
SHA-256: 65ad0d8991d3d538aa48512ded6e65eafeb3381523ff9b392a28369c7743433a
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10680 bytes
SHA-256: 9e12b8ecfff5e20b376c82eaf7e6d3c8efef61b3fae19598a8284d8d7b674298
font_02_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378