Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a25924c39c3c411…

MALICIOUS

PDF

74.5 KB Created: 2021-04-04 10:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 86970f3eac5dc3879078bb0ea514a29a SHA-1: 70ed8c97dac6ce36872c7eef73ae9b3de8f34c8c SHA-256: 0a25924c39c3c411fa16a9c416525848094fd9fe812936b2b5386348b70013c5
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 0.9998

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://seumenha.ru/123?utm_term=boond+boond+song+whatsapp+status PDF link annotation
    • http://gotexewadegu.iblogger.org/b612_camera_apps_free.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/aie9ihH/name_that_wedding_cake_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/aheFXji/vutikebawokesilomalafape.pdfIn PDF document text
    • http://bibuwobu.22web.org/marx_capital_volume_1_gutenberg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_602258d0ec8fd.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/where_are_the_tropical_rainforest_located_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/hjbThfB/happy_glass_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_6011705a3b4d1.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/tajune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_6032de361b61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60570e9fcac41.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/inferno_dan_brown_ending.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_895276d619de4fc28ee82d865c1d6d6a.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_384290167e174a3b8ba05b919612cf21.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_d5dcdfe720fe453684a6cfb07211417c.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_640b2e07e7404e17ba185289a45d60b9.pdf?index=trueIn PDF document text
    • http://putivukebeloteb.rf.gd/importance_of_arthropods.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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 5376 bytes
SHA-256: 2714bac3f0c51241a26029144f352827bc265ef99dbe79c1f8fa6b52d2a89d3a
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 10200 bytes
SHA-256: c6a9fd3740b3458b9ab9a34ea98d16dfa1e754ac84e0a5d67b52e4db5f589abb
font_02_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 16924 bytes
SHA-256: f9a7d6f00316bc2c84abec3f80d0cdc4be6e650c5020bf353ac1525f21a537dc