Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b934e1306f570a…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 04:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d45fca49f683552dc49beb19528f3ecc SHA-1: ed903b976a9b9707e11fa705bf41963080bd8e97 SHA-256: 62b934e1306f570ace58fc7768494d6aea85d0bed5b220b9d757c2499a5a5c69
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a critical finding of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The primary URL, https://lozipotod.ru/strik, suggests a potential phishing or malware distribution lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://lozipotod.ru/strik?utm_term=platero+y+yo+english+summary PDF link annotation
    • https://cdn.sqhk.co/kixowijeka/XXlhamF/subway_princess_surf_endless_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/7pvgjJi/flip_diving_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zebusukef/4JU3jhn/rally_racer_dirt_abcya.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/j25ibid/wuwitopavajo.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/79402950458.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/ghihijg/gamers_united_earn_rewards_for_walking.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/fl_studio_12_nexus_plugin_free_download_zip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_5f3a33d4f451409a93d1a2a67ec4f2a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/89113113697.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/21106381504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a105f89c-795a-4b93-820c-ba8e3d5ea301/best_online_guitar_lessons_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85c51c4-ecf2-406b-beab-32ab2d2ebcc7/bepodumepimakobefe.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_e9793bcd47fb452699874c96f5aa9a9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/922af798-2c57-45c7-9cf8-cb5a7659bb14/que_son_los_sintomas_de_mareos.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/biggest_video_game_companies_in_america.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/anari_1993_songs_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153698b8-97ed-4423-a939-5a732fe61c2d/51712246546.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_58b91094742b419a9e4977feddf6da3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/friendship_sad_quotes_in_tamil.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_6f61fb38ada24191a8fe7f1d35f5aade.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 5204 bytes
SHA-256: ebe59854ce88bc003bf0ea9a7661c11eafbf6a245e4fd56d3ac32e71f1ceb9f1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 12032 bytes
SHA-256: 0372e6df48bf0a5a20dfb3aa4be19684ae9a1eff3c93309d643db86515505f95