Malicious PDF — malware analysis report

Static analysis result for SHA-256 874103d72b1def8d…

MALICIOUS

PDF

82.3 KB Created: 2021-04-01 08:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d989cfbfd5703aeee9d66f5c757d597d SHA-1: 515a8e8a87ec50ce070c8e60abd21b65d6d1e58f SHA-256: 874103d72b1def8df7d5a7f69efce9bd4497054b79664aeac5c250fbdbae36c7
194 Risk Score

Malware Insights

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

The sample is a PDF document that functions as a link farm, directing users to various PDF files hosted on disposable domains, with one primary URL pointing to a suspicious domain. The heuristic firings indicate a malicious PDF designed for phishing and link farming, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=automobile+engineering+books+pdf+free+download PDF link annotation
    • http://help-business-media.com/probability_shiryaev_downloadl22rm.pdfIn PDF document text
    • http://parrrtner.xyz/dorawomaqy7lg.pdfIn PDF document text
    • http://static-get.top/51216322005c9l90.pdfIn PDF document text
    • http://pogadai.xyz/react_16_lifecycle_cheat_sheetdqwmk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_72bc29a3e96c47d6b942ff18a8467c8f.pdf?index=trueIn PDF document text
    • http://tamikukezinubi.rf.gd/bissell_powerforce_vacuum_cleaner_belt.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_e82a8437897842e280afe3fe9dd2ee4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/n64_emulator_pokemon_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5792c1c5-6bba-4e82-a6af-9b797aaf981f/maschine_mikro_mk2_studio_one.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_a785c8dfbf704f6aa5005e74dcba1771.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_ea0eb902496847749ec31dc5ec0cdd82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5062a40d-4101-450a-a431-f8100e3bfbbd/pukizewovaxirajoxod.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_4e7c1531c2fb41df8774c9c1514d0edd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/8156053652.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/what_time_is_nyse_closing_bell.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_bb588fb5d4de417bb4c0d92cf49f883d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/what_is_the_best_character_in_diablo_2.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_e53b566b7f6e45e1a02de81f9ca5fe0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0113e92-e3cc-4779-b43d-0bb8a66e2626/masks_powered_by_the_apocalypse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7048860-a6c0-4d47-9d37-8fd3eb207dfe/comparison_between_leader_and_manager.pdfIn PDF document text
    • http://vewajelawukos.rf.gd/solaredge_55kw_inverter_datasheet.pdfIn PDF document text
    • http://xogowakowokavuw.rf.gd/119355433.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/pazutekawubirawoxoruvaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e3ebc7-f9f4-4c7e-968e-927ef30f370f/pexiviwef.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5648 bytes
SHA-256: 0cb4c7b39878022dc5465cbb174dcbb33db44bf20c28335711332eb431b69438
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 11040 bytes
SHA-256: d3489325e634656dcb06324a1b44cafe493a5ba6570000cf1418e335012050d1
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 16172 bytes
SHA-256: 461a1578f80084b2f2ca998a6e716936969cc9b33b2976d66eaaa57f6abee57a

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