Malicious PDF — malware analysis report

Static analysis result for SHA-256 929cca441fee365c…

MALICIOUS

PDF

72.7 KB Created: 2021-05-09 00:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9579ce8656ab2ab0ab444c2cf42cf9b6 SHA-1: dda4d6d4d0a6e5e37061696b54cc68631008ea65 SHA-256: 929cca441fee365c03cbe797aeb7dc5f23796e372da346de0f958cfbb4dc8fa6
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 functions as a link farm, containing numerous external URLs, with a primary suspicious URL being https://nipisod.ru/strik?utm_term=the+man+who+couldn%2527t+stop+laughing. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content which can be abused for malicious purposes. The presence of multiple external links, some on disposable hosting, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=the+man+who+couldn%2527t+stop+laughing PDF link annotation
    • https://cdn.sqhk.co/kixowijeka/giyhhgg/dragon_ball_advance_adventure_gba_download.pdfIn PDF document text
    • http://majikok.mygamesonline.org/45749042395.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/gVge1gQ/life_simulator_game.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/itr_acknowledgement_form_2020_17.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/cDTxjd1/best_of_the_eagles_album.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/Lghygje/mediq_health_coaching.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/1319474563.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/88876749735.pdfIn PDF document text
    • http://rupiwot.getenjoyment.net/9659047536.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_a7c2c8a92a5844ba83993fa652d21ee5.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_b8aff3f46aa74c9b828c2539da9234de.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_28bca04fc3284f3aabcb9b258b4e4ae8.pdf?index=trueIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_de3ece404d8b444583783a754d36a444.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_836f1c4dd2594eb282ecf059a169587b.pdf?index=trueIn PDF document text
    • http://rodexiguv.onlinewebshop.net/67558451415.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_cf616ab76ec74b7ca0e63a616f895980.pdf?index=trueIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_b7a9b89a7203426381f0ca8a927a027c.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_1a381d66b87243089af5ddc34283f82c.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_a1922f758265428488d0a42a990516d1.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_37d3b5701977421580c85b389a5555fc.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_e8c18f8a7462459cb08f09a3ab959587.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_458a410340c44e00884f82929d3fdc4a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 5348 bytes
SHA-256: 258bb7e2f402a24e643599b233ea6b76b37d7e3a91bca77139e1687f4fbc11ce
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10724 bytes
SHA-256: 368967df2c7b07ed4641924785576a31b421acb23ab119631d769106be15c12f
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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