Malicious PDF — malware analysis report

Static analysis result for SHA-256 3396c91108470745…

MALICIOUS

PDF

91.1 KB Created: 2021-03-18 00:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0726e58800b2285f442438cb25288b4e SHA-1: 1044f6ca12a93399f4af0eba2ffc3102bbcd8d21 SHA-256: 3396c9110847074507e28e36b8e01a4486cb9205c7dd1668d9c665e1bb28a9f8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://vilenefex.ru/award?keyword=warranty+deed+arizona+pdf PDF link annotation
    • https://cdn.sqhk.co/gavivevok/RRjcoie/samsung_galaxy_j2_ringtone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/lbgeXjh/71152127970.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/he9Mjjf/bajegolevixovusidekuf.pdfIn PDF document text
    • http://pixelbarista.com/skyworth_android_tv_55_inch_revieweeii6.pdfIn PDF document text
    • http://virnet77.ru/busuu_premium_apkpure3gfgt.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/hiasjI0/uefa_champions_league_results_match_day_3.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/umjdii2/18261885703.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/diKg3yc/glitch_video_maker_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wukorovev/jggWTKv/16392572594.pdfIn PDF document text
    • http://egosikenclub.com/85623543731qxuak.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/XUjiMgc/vr_warszawa_burakowska.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_07ded81f78244ce6b487842034529b9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/2373459214.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_5564f8d5b5d944a8b030212b6989ee15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/93924931183.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/halfords_apollo_bike_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/3403631546.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/vowesar.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/abinaya_song_wapwon.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/beholder_2_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/denon_avr_791_price.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/troy_bilt_pony_42_deck_belt_replacement.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_087fa18aa1694fb1aa2ece43e7e434b0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 4988 bytes
SHA-256: 73f0f707c51b8a505336806fa14463c3ee84c692db81152f40fd59addd3e7344
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 11280 bytes
SHA-256: 26699447f32121d80dddb65ec35614f8647596d7b90912a0b464dfa3ff830b5a
font_02_sfnt_off00014915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14915 16272 bytes
SHA-256: c00967218536523c6bda31032b938004c63e0cb5f92639e0843199feda2a8965