Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7805a444739276…

MALICIOUS

PDF

82.2 KB Created: 2021-03-12 10:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af99efbb08edd2cb1623a7d4d8a8e163 SHA-1: 283017ed0e0528fdb9bc9a3ea0ca0f44f2f2282d SHA-256: fd7805a4447392762fe7c85f4c4d9c0fc5a03d2676171fa6baadf8273f1e8c11
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 0.9996

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://jottigo.ru/wix?keyword=wotlk+frost+death+knight+pvp+guide PDF link annotation
    • http://tuvosudokalidu.scienceontheweb.net/98543015735.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/cissp_for_dummies_latest_edition.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/mcgraw_hill_answers_science.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/bosjdzb/water_slide_extreme_jump_house_rentals.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/how_to_improve_the_left_side_of_your_brain.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/ghNDigq/aircraft_mechanic_jobs_mobile_al.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/yageEij/best_satisfying_slime_video_ever.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/didubatodixilivu.pdfIn PDF document text
    • http://medicalpracticementor.com/binary_file_format_extensionuxcog.pdfIn PDF document text
    • http://torixobo.mypressonline.com/lasorixanokav.pdfIn PDF document text
    • https://cdn.sqhk.co/musamari/b5hehaw/android_developer_job_vacancy_in_chennai.pdfIn PDF document text
    • http://sfhgfje5df.xyz/whats_in_a_name_activity_sheetrdl23.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/27763518990.pdfIn PDF document text
    • http://vash-fasad.live/intro_after_effects_templatex8fn1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_031b56e02f22411ab30a3973d19715c8.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_f35f7934ab474921a0f86da933d775df.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_72e5902f3fb24720b205acf71e26498d.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_9870fa8c853446fabe80f61fdbeb8245.pdf?index=trueIn PDF document text
    • http://mivurukelino.onlinewebshop.net/circuit_breaker_siemens.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_a8632fc98f1845478139228e3fa1871d.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_44cb3e249c4b4ed7866aee35fd8678c9.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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 5440 bytes
SHA-256: 71735dbead6d4262d27bad9455712a0f642e5c816446153f4e4f4378658b6078
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 10812 bytes
SHA-256: 3ffcbbc1ac27edc04e4ec9125953671f0103eb7f727dee4b3afeeea0831b1102
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 16240 bytes
SHA-256: a180d3a50eca3ddcebf424b1183e9f30455a78618e3ed76e4389bca50b1fd8c6