Malicious PDF — malware analysis report

Static analysis result for SHA-256 2924b5c365203f1f…

MALICIOUS

PDF

88.4 KB Created: 2021-03-08 22:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 71483cce8d873f94ba9c72bdda344291 SHA-1: 66cc5db783e490bc70cc6f093fd4d134d8bc195c SHA-256: 2924b5c365203f1f7b28e392e2fc9f826681e9af1747c693beb479bac3facb94
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=decomposing+numbers+worksheet+1st+grade PDF link annotation
    • https://cdn.sqhk.co/noxivudeva/ghhfOjc/gameboy_advance_pac-_man_collection.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/ticXiib/xadulep.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/debawuvevudiliseji.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/what_are_the_features_of_phonology.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/pinodonor.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/gp5Hxgd/suppository_definition_in_pharmaceutics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_17c7a30d400d4f6e9e265193fad9db91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c2a07a-dd5e-421e-83b5-d75bbadc36a6/how_to_heal_picked_acne_overnight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766aff4e-dd5e-413e-b50d-4f15542e1b0a/zowogajerawup.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_b0b94933bb844429ab7cd5dbfc280ebb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a0c90a-1b4e-4eaa-a456-1de951222e20/richmond_power_vent_water_heater_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67feb86-43b0-47e1-a911-ded1aafe3438/sta_rite_dyna_glas_pool_pump_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f814793b-fd34-4e54-833e-1bee14aac8a7/45982689817.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_7ed1946a3a1246aba7c1f08693719851.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e68fb95-26ee-4413-8778-2d6ac2afc852/how_to_get_rid_of_belly_fat_with_resistance_bands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f0b21-3c5a-4385-a1aa-8fe387319358/how_bp_apparatus_works.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 5800 bytes
SHA-256: bd6962391eb65d4d2f74ad3008e30e7406f253a569a60b00beab68ea24d9c11b
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10472 bytes
SHA-256: 10c3b211c47b68059645d5f67ec4e3ed5a17db130ebfd10508be4a73dcb8d831