Malicious PDF — malware analysis report

Static analysis result for SHA-256 facf3e52876a0140…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 03:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ccf1cefd3670baa57388618d608fb5 SHA-1: 966bd02e44a5966a9d34bedb9a2c5d65cf3ab9a0 SHA-256: facf3e52876a014040892a9029a5a29dda88c8b58cda003efa92c9f1efc11925
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or SEO link farm attack. It contains numerous external links, with one prominent URL being https://zajinet.ru/strik?utm_term=niv+life+application+study+bible+large+print+thumb+indexed. The document body is heavily obfuscated, but the presence of embedded links and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=niv+life+application+study+bible+large+print+thumb+indexed
    • https://cdn.sqhk.co/mamevugixej/ULgfb7N/throne_of_blood_streaming_english_subtitles.pdf
    • https://cdn.sqhk.co/najuvotuwoz/cCjec3k/free_tv_shows_on_amazon_prime_list.pdf
    • https://cdn.sqhk.co/fujonexa/wHFjbXc/biceps_clicker_hacked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/norozovijalu/vanilla_sky_full_movie_moviescounter.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_3a89730fce154382b47e53f4b1ed8c46.pdf?index=true
    • http://zafuriket.rf.gd/integers_and_rational_numbers_worksheet.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_0722174cd3074aaea75dbf6e4743e588.pdf?index=true
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_822b1850edaf4932b46a27ed58ae797b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44ced8ae-7536-45a0-9466-70e587b429fd/ligesavobegonixetabu.pdf
    • http://delenujafoxa.rf.gd/baseball_card_sheets_walmart.pdf
    • https://uploads.strikinglycdn.com/files/a9408eae-b53e-4642-9903-e3aac42c6b12/how_do_i_start_my_own_blog_for_free.pdf
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_b5f2d64c90aa436d911a029077eae606.pdf?index=true
    • https://s3.amazonaws.com/sakaburepagase/accelerator_plus_crack_pc.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_0a4af897f4884631b7bbd893d4051711.pdf?index=true
    • https://uploads.strikinglycdn.com/files/42e8b0b9-cbf6-46ad-ade5-3a22702f82a2/panchatantra_stories_in_hindi.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_239ff735592e45959ae4e695a3620b67.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08b.bin
2e6911c222eec8f863a25b42a78f3f47b7cea5e8058b02ed17baf1353e791118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5908 bytes
font_01_sfnt_off00010492.bin
278797aaafa01c7e44eb43565e589cdf5d106dbd2721874a3b63e340b834bac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 12252 bytes

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