Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa7a6b8be254ef2…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7461ad1f6473c2d6a84c00f0c4994901 SHA-1: 79e4160c677943109f0b39faef36fa312a4daaec SHA-256: 3aa7a6b8be254ef26369a7e1355dd2231e6f8e65bcb6d8b94bdd2154c64902ba
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/wix?keyword=gas+laws+worksheet+answers PDF link annotation
    • https://fifabazu.weebly.com/uploads/1/3/4/7/134702458/libutalumuwifobol.pdfIn PDF document text
    • https://vusozegaxu.weebly.com/uploads/1/3/0/8/130874635/9690374.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/duxerizisufi.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/26272192023.pdfIn PDF document text
    • http://tosemuzariku.iblogger.org/wexomedenewenopasamabejo.pdfIn PDF document text
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/pagixelof.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/vexapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7127b133-a599-449e-ba5c-710e42680d38/pentair_easytouch_and_intellitouch_manual.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/monitor_cardaco_polar_ft7_com_cinta_de_transmisso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ad0b3c-cc79-4daa-8ec5-30a612203d52/nevufaremerewufovipewadad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e57843d-7472-482d-8af8-c4ecfe7c156a/90583701036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c45ba3d-39ba-4a69-a57e-0f6342f28434/8928242659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b4a631-a5df-451d-aa89-818d66fee0cf/faxezowixomutuzefuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70253e4a-b67d-43c5-ae26-6a71305156b5/how_to_factory_reset_jbl_xtreme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d1370d-3db7-4e5f-976e-02d96cea551f/wiersbe_bible_study_series_vs_b_series.pdfIn PDF document text
    • http://mekamijixakino.epizy.com/adding_and_subtracting_mixed_fractions_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba2d9eb-c140-4d86-be1b-5a5dd6a7abb1/60582256848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3308f466-ba3c-4134-a456-24e2b1bec1ea/twilight_2009_tamil_dubbed_movie_download_isaimini.pdfIn PDF document text
    • http://lewomunenuvi.myartsonline.com/65766725082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56fa3b7-b07b-4eb0-8391-721245f12369/turimotalotipigajafusagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef484efa-36eb-4be5-9af5-8aa6bfeb0c04/farulawixisiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258dfe93-ea9b-4531-abc2-b5ca092471a5/what_is_the_boarded_window_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181bb0d5-02df-4bd4-8e30-bd3a7c5d9231/70084997878.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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 4960 bytes
SHA-256: 636126907bfb98bbcad1e3aa520b084dcce5e8013a5752d862023551dcb0d39b
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 11476 bytes
SHA-256: 15fffd3f8d6d7e32dc6ac5a29237a81c2d2afc6e591dcae27f643a3b639ac2a7