Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b62c771160a8fb…

MALICIOUS

PDF

75.9 KB Created: 2021-05-05 10:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f0e90cde135f7750e75982e269420bd SHA-1: 36def6a0d04a7c64a685ccf67908e3e968b20224 SHA-256: a4b62c771160a8fbbfeb05d9c0523fb749ff4b60328710060d16edb7c7b80eec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://seumenha.ru/strik?utm_term=html+and+css+for+beginners+build+3+projects+from+scratch
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/f4ea7d54.pdf
    • http://jushq.pro/sixudi4lsz.pdf
    • https://lejalebenepuk.weebly.com/uploads/1/3/0/7/130776022/naxadotuxitabel_tubafapama.pdf
    • http://onlinekartiadesi.com/how_to_test_real_gold_jewelry9ff67.pdf
    • http://13millions.store/43017820376j87tx.pdf
    • https://rogaturo.weebly.com/uploads/1/3/1/0/131069781/7518811.pdf
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/sakofeja_kudagoret_lovat_zixunizopibula.pdf
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/4b840a8a.pdf
    • http://sfhgfje5df.xyz/incident_report_sample_letter_for_cashierdoigp.pdf
    • http://realwockyc.info/vuwixifikilirowokeralcigz.pdf
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/gagevekeg.pdf
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/6845a42ba968.pdf
    • http://yildirimotobursa.com/718431435057wuvm.pdf
    • http://ppl-nutrshopfit.website/how_to_make_a_paper_folded_stary4gmi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6ff0363-81d3-4c9f-ad4c-500bfacb0599/act_2016-17_practice_test_answers.pdf
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_a73f771ddb4944a88e0faac45da3eef5.pdf?index=true
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_b07f510503064eba915a3983746d72f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfce06b7-070c-4aff-af85-373fb9b1e514/what_do_you_call_baby_goat_in_english.pdf
    • https://uploads.strikinglycdn.com/files/1da2cdf8-0e70-42b8-9dc0-aec3e7eff70d/warhammer_40k_rulebook_epub.pdf
    • https://uploads.strikinglycdn.com/files/3386ab7b-a69d-44f6-9ec5-e09893f0797f/how_to_test_ecu_ground.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_ffc64c00dc0f41948de24fcd1505b908.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_018700f83ad74230a893491317eb10f6.pdf?index=true
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_2fd41006dd684d75bc7485d0a4e836c9.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_off0000e962.bin
1d421c330a86366838a6bb213657b4631a9f7b66511bfe9474efa3986bcdf544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 5912 bytes
font_01_sfnt_off0000fd56.bin
81c42a7389bdf1e90b5055a6bc016ff4ddb6b463ff8cd6cfeb35def38b6be3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10592 bytes

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