Malicious PDF — malware analysis report

Static analysis result for SHA-256 507c2fc6bfa454fe…

MALICIOUS

PDF

85.5 KB Created: 2021-06-04 12:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25857730605fb031f4aad9acc3b3b019 SHA-1: 5f944583d6d6ffde601421d1933982175150e566 SHA-256: 507c2fc6bfa454fe21a16158bd1463c2c4e62c68554f4ee3c443e156cdff05ed
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The embedded URLs and the document's structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 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://jumiwimov.ru/123?utm_term=i+speak+six+languages+sheet+music+scribd
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/268944.pdf
    • https://cdn-cms.f-static.net/uploads/4422645/normal_60333fd3465a6.pdf
    • https://zofomuwane.weebly.com/uploads/1/3/4/0/134040850/babirixadabodijij.pdf
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/4329953.pdf
    • https://cdn-cms.f-static.net/uploads/4475196/normal_605ba86e50e0d.pdf
    • https://cdn-cms.f-static.net/uploads/4419003/normal_603364a1063a7.pdf
    • https://pixokunotozonux.weebly.com/uploads/1/3/4/0/134017876/dubolanar_fesuzamaxavuku.pdf
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/wumedosovavud.pdf
    • https://fatajoser.weebly.com/uploads/1/3/4/6/134655124/6536fdf529.pdf
    • https://static.s123-cdn-static.com/uploads/4381762/normal_6008cd45f2756.pdf
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/nedal.pdf
    • https://static.s123-cdn-static.com/uploads/4380680/normal_5fe5b46225291.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sisagexal.pbworks.com/f/how_to_stop_bleeding_from_esophageal_varices.pdf
    • https://uploads.strikinglycdn.com/files/b9efa917-c935-460d-aeae-e9fa1fa10e04/is_sodium_perchlorate_acidic_basic_or_neutral.pdf
    • https://uploads.strikinglycdn.com/files/0ea62dba-612e-4720-9c88-21bc782b591a/zilureweseri.pdf
    • https://uploads.strikinglycdn.com/files/9306d2df-2224-4d43-ab1b-86f36c5da003/antique_tappan_stove_for_sale.pdf
    • http://mapaduzipi.pbworks.com/f/law_dictionary_english_to_urdu_free_download.pdf
    • https://uploads.strikinglycdn.com/files/8959bd6c-cd8b-41a4-8b6d-a56600106f66/riponoba.pdf
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424272/generic_usb_game_controller_driver_windows_10.pdf
    • http://gepefupugalu.pbworks.com/f/pokemon_x_mystery_gift_codes_citra.pdf
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144507210/solids_liquids_and_gases_homework_year_4.pdf
    • http://poforezufovu.pbworks.com/f/what_herbal_essences_shampoo_is_best.pdf
    • https://uploads.strikinglycdn.com/files/14f302d1-37e2-4dc7-be30-01a1f2181f05/what_a_lovely_name_piano_chords.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022c.bin
8d0bd04efc311f8cdd727c58d4459b4e88a33d29aa956808ca1dcaf9445cefc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 5468 bytes
font_01_sfnt_off00011485.bin
ad5ce464d0478867b36f6230d8339df1b5e73e1cd17b1467ecb62060af1fa652
pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 11200 bytes
font_02_sfnt_off00013a7c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 4324 bytes