Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9938c9f2a190ef…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 23:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 228bf30b08334d111762e64aa5e323fa SHA-1: af516614692c12d1e2b69f515dc0374ecbe8b965 SHA-256: fb9938c9f2a190ef8d5a002ba921ccd72a4792308ad8ae52d7f318bffe83b413
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 0.9996

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://xajibur.ru/wix?keyword=zombie+trailer+park+unblocked+4+life PDF link annotation
    • https://cdn.sqhk.co/fazituku/jfQYzjg/alarm_button_for_elderly.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/how_do_you_find_your_gpa_on_infinite_campus_student.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/efE2ghj/raterudelodakas.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/QifijVx/xurozep.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/jczttjc/netflix_cuties_cast_members.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/nuwevinoduluvadepojaw.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/2vVgdhd/strikers_1999_mod_unlimited_money.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/denervation_hypersensitivity_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/tjh2hf5/say_hello_application.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/architecture_portfolio.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/33470096689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_749ee7c6c89b448b925e852190e15ebf.pdf?index=trueIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/build_my_life_worship_song_lyrics.pdfIn PDF document text
    • http://gomojilen.rf.gd/dometic_rv_hot_water_heater_troubleshooting.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_e7b5cbbb571844c8aa0885e73d96faca.pdf?index=trueIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_561897204cf8444e9b0c1bfb8eb2d7a0.pdf?index=trueIn PDF document text
    • http://xibobok.rf.gd/36951375092.pdfIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_ef8f78e6f7bf4e5187e86fa07d8617b3.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_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5372 bytes
SHA-256: 573cbe3190e31eb913f115cc2b03d2d44afb9d5cf7ce024f3815e1e6dbd3fe02
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 12484 bytes
SHA-256: 663937eba15ec5df404bcf8a8f7ccdc347df0bd9288fab97599302a5deed4c89
font_02_sfnt_off00013497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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