Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1387d1a9c7f51bd…

MALICIOUS

PDF

96.0 KB Created: 2021-04-05 20:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c9d8a50a3b01188298b865c476995b SHA-1: 7ef6acaebb734a29de6a268c79a7fbbb576e2f48 SHA-256: c1387d1a9c7f51bd0f6f2863bdb629297233a71f8227e53db39f7197f8326421
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/wix?keyword=wolf+motor+function+test+items
    • https://cdn.sqhk.co/xibumediw/SG3ge8R/degimolonagidoxapu.pdf
    • http://idealica-italiaofficial.site/five_basic_relationships_according_to_confucianismgrmsr.pdf
    • http://mon-cmb.best/nofumineroramogogazajg044.pdf
    • https://cdn.sqhk.co/bosesegivu/hj5DhcL/99823818622.pdf
    • https://cdn.sqhk.co/tirekidifole/huhighg/karimugogabekitejixa.pdf
    • http://razvivatel.blog/trail_climb_mod_apk_revdlata1p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_3a112cdeae9449bdb6c771d0a4d9ca31.pdf?index=true
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_b6e24ca29a234e7e9b4d453687590694.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b2044fd4-9268-4d04-90ea-45538a9227e4/20109707720.pdf
    • https://uploads.strikinglycdn.com/files/65294110-873c-4bb9-87fe-2057b3628ac3/hp_e93839_motherboard_lan_drivers.pdf
    • https://uploads.strikinglycdn.com/files/7dc30842-c9af-4061-ac11-1b65df9471c9/john_deere_1330se_manual.pdf
    • https://uploads.strikinglycdn.com/files/432858ea-e24c-440a-895d-a340cde79288/47191196147.pdf
    • https://uploads.strikinglycdn.com/files/ae888d37-7a9a-42a2-8498-906bdac1cb2a/how_many_calories_in_a_shredded_chicken_burrito_from_taco_bell.pdf
    • https://uploads.strikinglycdn.com/files/8362e42e-4485-497e-84bc-931b80ee85c8/tabletop_rpg_game_stores_near_me.pdf
    • https://uploads.strikinglycdn.com/files/42a4c390-d5e4-4b46-a510-1146ae0df00d/87625838540.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_5fd37d7241de49748bcae6c7714310b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1cda73db-d647-44e0-b7a1-bf6edb6d4f08/the_hidden_oracle_google.pdf
    • https://uploads.strikinglycdn.com/files/3cc6948b-d63a-44af-9dee-4c0c1c10a97d/casio_aq-s810w_price_in_bangladesh.pdf
    • https://uploads.strikinglycdn.com/files/57cd9703-54fe-4760-bca0-2a8bf0fa64e0/77961893969.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012df3.bin
9763b41b5b8527d19d49630396be802b18694fa7c1c0803d84d3efdcd57092b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 4712 bytes
font_01_sfnt_off00013dea.bin
31b158f71e6078f5c28b20614739b43c35f54b3a8d7b61a4de31436a1829d99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 11548 bytes
font_02_sfnt_off000164a0.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164A0 4324 bytes

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