Malicious PDF — malware analysis report

Static analysis result for SHA-256 adafb0545531190c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 20:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3505d186608fcb4c5bed885723cfa96a SHA-1: 735fc800bc574673051c3eea9ee60e7b83c945df SHA-256: adafb0545531190c5eba5a23548803041aa2c100dcffc2d04dcdb702c92389dd
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 0.9992

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://bologen.ru/strik?utm_term=how+to+turn+off+ego-t+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411001/normal_6016517b2a07f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_602724bf93977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_6015b1699ebff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_605d919dccb1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451544/normal_5fe535159d4d5.pdfIn PDF document text
    • http://onlinetiser.website/83843346188ws2zc.pdfIn PDF document text
    • http://kigurumi.org/kikekufep8n18j.pdfIn PDF document text
    • http://1freedom.space/android_10_battery_drain_pixel_3aacj6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6b1e34-7615-4f53-9d63-4ecd0d6df3f2/how_to_set_time_dsc_power_series.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_98dedba3801848828a769447e7452f84.pdf?index=trueIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_e477e30a6413443f871c6fc2057e0ba6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed504fdb-1216-478b-aca4-581e7ca0109c/what_is_indirect_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0354ee-56a4-4d41-a581-3d9bf073e27c/kenurubumesapiwarolasabuj.pdfIn PDF document text
    • http://juvizerosuzabuk.rf.gd/28594082690.pdfIn PDF document text
    • http://rovetenexosa.rf.gd/zenexipipude.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_721fa8514e4f4081a150b57f393a842e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fb1f71-08ad-4439-bf94-20c240fbf289/73141451969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e0fe70-1749-4fd9-be8d-919dfd947aa6/the_diabetes_code_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43ba142-b89b-4bfc-ac45-9f08be9cc3a2/present_simple_present_continuous_exercises_for_beginners.pdfIn PDF document text
    • http://xafupovavosife.rf.gd/xuwaduwiter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b14ca0-be18-4843-aa34-5bfd210be6ff/77002304635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3003513-cc11-4b4b-8bfb-f47c8e479d2a/mean_median_mode_worksheets_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cb4046-d690-4f27-b9ba-07fa7f2a1cfc/briggs_stratton_intek_engine_repair_manual.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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 5052 bytes
SHA-256: 22d0d5b40236b49b363ae49566f7d747d1f3aa1691388a2e57373efeb37c747c
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 11396 bytes
SHA-256: 9ec20e7b737b3806b39cb89a714acfbb8cecc589175f0390cb39e8fbf6d72878