Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67b23f98bca6cd1…

MALICIOUS

PDF

94.2 KB Created: 2021-03-20 14:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 86aad4f01bdce27bbfe75fa1b1b06b61 SHA-1: 52a52224985e6a486b23142dd8b1006b072e2001 SHA-256: a67b23f98bca6cd1e2f83bdd42b965f793d128f493a46e26fcb494b1969cbc3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=sanyo+pro+xtrax+multiverse+projector+plc+xu41+manual PDF link annotation
    • http://datab.vip/why_does_my_printer_keep_jamming_papermioof.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/qqasjib/best_racers_at_richmond.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/9hhEtge/video_bahamas_airport.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_60184591a1296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426688/normal_60017e3c7e25d.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/ggTUB9M/gibbets_bow_master_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5fe49db5779d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_60072281942f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6009e66c92d73.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/iijggeS/joseph_davidovits_geopolymer_institute.pdfIn PDF document text
    • https://cdn.sqhk.co/gewurasi/hNNgfgm/zarchiver_pc_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603902e76f67d.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/37656938191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ffca7e859930.pdfIn PDF document text
    • http://legiontry.online/39723241592qaobx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fc73aae325cc.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/munivaxodafuxadovogatuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5ff809165b7e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexizijisub.atwebpages.com/cost_accounting_a_managerial_emphasis_chapter_5_solutions.pdfIn PDF document text
    • http://bodudenijijeb.onlinewebshop.net/sprained_ankle_rehab_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d270e74-f59b-4323-af16-0668a57b490a/tree_of_life_washington_coast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e53182-2c21-4c7b-9e17-58782f8650a5/ninjago_season_11_episode_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40815d76-02ad-42c1-bc71-17d0840a72ab/79927451853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee67c482-5a63-42c5-abbc-135c4beeb1db/71029471668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b4d281-2b43-4edb-bc5a-b37a9f3ce431/sajosases.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 5628 bytes
SHA-256: db0b54c5628daca5a93350b5369dffe7a192d7dda66d9ac0cb1cd2d895439cdb
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 14304 bytes
SHA-256: a2bd723d4e6d0eee1886debd9dc19bafff268bd011ef4170212e1e3ba61e9391
font_02_sfnt_off0001517f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517F 16548 bytes
SHA-256: d64987080a14f01100775dd7d249ad87ea2d3289f98a3690f00471b4c3911710