Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd0aae656d72f22…

MALICIOUS

PDF

74.4 KB Created: 2021-05-17 08:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04955569d305f3e433d82999019ef18c SHA-1: 20543230e6c4dc7bb120401b874909269f3239fc SHA-256: 6cd0aae656d72f22eab39be102824c1a598d365200bfc31fcc8debcfaaa664a2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to drive traffic to various websites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of 30 distinct links strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or SEO spam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/wb?keyword=coefficient%20of%20friction%20worksheet%20answer%20key PDF link annotation
    • http://xirapanagix.getenjoyment.net/jumuwagu.pdfIn PDF document text
    • http://watogoda.mypressonline.com/tozupuburomivogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timawerana.epizy.com/value_investing_stocks_right_now.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_a9e36709c3e947628f7f0ce4d3bf97cc.pdf?index=trueIn PDF document text
    • http://nabobaze.epizy.com/why_is_my_order_taking_so_long_to_ship_usps.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/calculus_on_manifolds_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19df774-571c-40df-820b-45ef7b49679f/tolunegekenonewase.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/how_to_calculate_mixing_ratio_from_relative_humidity.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_b139a3863db14bd8a6e42d6bc603ad2b.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_868093c9d51b45af8dad04c700a628b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/98499617130.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/canada_food_guide_milk_for_toddlers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339fd1e7-1279-4d4f-805d-4c451aaf6483/which_convertible_car_seat_is_the_safest.pdfIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_e47dbd1d851c4a6aac1c548bd7606a3d.pdf?index=trueIn PDF document text
    • http://zerowegujij.onlinewebshop.net/89019579003.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_5c75ed7b94544b39b1f90c2faa792512.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_f7a24174985b45d7a1e019dad93b7191.pdf?index=trueIn PDF document text
    • https://3c3a732a-bc26-4be5-bc29-345d3dbc3408.filesusr.com/ugd/63a963_656448915cff4746a6faeac44c0406e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/81460744570.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/game_sailor_moon_android.pdfIn PDF document text
    • http://fabonejane.onlinewebshop.net/plant_biochemistry_and_molecular_biology.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 5100 bytes
SHA-256: 6139b3560458748dd49a43709d005bacbc406d8862548db477cf9fd8d0dd0a2f
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 11268 bytes
SHA-256: 31f996637ec1424c69378b625cfca1a35083a4fe14581074bfbd63f971303225