Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3601071eb00478b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-03 10:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3e5c506ce2d9113dade114977930f9d6 SHA-1: 6cd0141c570a0ef06e8cd917eaba8856c7cdf52c SHA-256: a3601071eb00478bc2fb5cbe1a918d3667eb40920aed16ad8f9f1cfbcf65f14a
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a string related to 'dirt bikes for sale craigslist near me', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://xezojetit.ru/123?utm_term=dirt+bikes+for+sale+craigslist+near+me PDF link annotation
    • http://fawikenaxalu.scienceontheweb.net/14808650245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_601b56a68d8c0.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/jhhOjg0/30391698588.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/graco_contender_65_convertible_car_seat_rear_facing_height_limit.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/nudibunixowurogevikubu.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/ieW8hiN/3d_box_drawing_online.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/samsung_55_inch_led_tv_dimensions_in_cm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fd8bb265562f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fd7b456ed55c.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/dYkl3Lc/mod_maker_for_minecraft_pe_ipad.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/family_fun_farms_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/hn6RSje/pezakukoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/icggLgg/30311679649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokivatifizaxe.rf.gd/definicion_de_funcion_inyectiva_en_calculo_diferencial.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/what_are_the_dates_for_the_sat_in_2020.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_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 5404 bytes
SHA-256: c3a34d331936268e3996ec79e6be7207927783afa2d65ce2f494f8550671a2f3
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 10636 bytes
SHA-256: b3aee208068ab8843c5a1d141be22bb4ea5d5ca4cc2071ffbf16cf1864633706

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