Malicious PDF — malware analysis report

Static analysis result for SHA-256 a375bae80ba78337…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 22:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e7a81b19e4ffadd6b1853ab557318cf SHA-1: ecdd3755c3140fc79ffa36575e2978f12d07faea SHA-256: a375bae80ba783377f08bae2e9306fe1ac8aadae8d7e9bbc8d09bf2d0ab59edf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. The embedded links suggest an attempt to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=what+does+the+game%2527s+a+bogey+mean PDF link annotation
    • http://wowit.pro/problemas_resueltos_de_fisica_preuniversitariayspng.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/Ybhbohc/.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/LrFhgPI/wulopebagogafi.pdfIn PDF document text
    • http://0fruits.space/95663153826svoqi.pdfIn PDF document text
    • http://b0xberry.online/633899775883actn.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/hfujhid/roman_numerals_converter.pdfIn PDF document text
    • http://qwertyujg.xyz/xinoligilonebofobiptmzf.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/548003184335qvhw.pdfIn PDF document text
    • http://daddytestit.xyz/wekolebasifurimxmi7m.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/jfhdMie/virtual_truck_manager_2_tycoon_trucking_company_mod.pdfIn PDF document text
    • http://vengriya.space/similarities_between_cats_and_dogshdsul.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/iSwqPif/smash_ultimate_all_crowd_cheers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_7ff9b09595284b8db2bf07ec80dcf6d6.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_3b26a38baa824ba5b3bef5ab43b34690.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_97654990ba804298bc36b444406c0c25.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_8f79458f4c564b049844a48b0d56c4c1.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_b189bd3942c746c79613ac1e39977104.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_0b1aac81e1644a02aae389090873fee1.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_a1dda6e219a142b1b188cad2f9b04c71.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_d014cc2bcf5b4d2c87ea9d2881e715e0.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_629dba9eaf404d6995025f7e3cb8b2d9.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c830b98affc94ff08b7e2cd8189cc73c.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_74ceffa2a26a47c5928471a6c27c1335.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_f82b8b595adf420d9428e6ff342f716a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 5400 bytes
SHA-256: 48f41d09dc502818e43bfcc74929ef5f620031e0e000c53c4fb6bd7917063a3d
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 12628 bytes
SHA-256: acc289902c7652a4d4799afdc6499c600ff4fed99fb5903e5c128939cf622466