Malicious PDF — malware analysis report

Static analysis result for SHA-256 331f1dc43a116c59…

MALICIOUS

PDF

79.3 KB Created: 2021-03-27 18:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a801789c4a92c1bf3cd649651024efba SHA-1: 69c37b9c186f5f877b9d42fd9726d158e3c3de11 SHA-256: 331f1dc43a116c595bc256e2850b6e80382ab3e983281c8ed0ed95741e62d7d0
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. The primary URL, 'https://crophysi.ru/strik?utm_term=toshiba+tv+50l3400u+flickering', suggests a lure related to technical issues. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/strik?utm_term=toshiba+tv+50l3400u+flickering
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/e851bf4a24f3.pdf
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/2d31aa0f7.pdf
    • https://cdn.sqhk.co/pibutuvopedu/hhoheib/doraemon_game_apk.pdf
    • https://nekewagan.weebly.com/uploads/1/3/4/8/134881830/2744833.pdf
    • https://cdn.sqhk.co/jupozaregu/eF45fib/nukofojadifujubajaziri.pdf
    • https://vedisowokiwovos.weebly.com/uploads/1/3/4/7/134767265/ragajusoj.pdf
    • https://cdn.sqhk.co/molipigi/he0yji6/fanimuxevosiwajabagabu.pdf
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/615078a175fd0c6.pdf
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/80bb6f0518d.pdf
    • https://cdn.sqhk.co/mokevesin/j1oBZHG/megigipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_3941c995cf44466eb53ab6fbde4cba48.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2863d5c5-741f-47ad-9079-9f82e1268628/2010_chevy_malibu_electric_power_steering_pump.pdf
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_5d77e467e3a34ecb81159e3c134b3eeb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2c549cc-5f74-4374-9c91-387dca7128c8/what_is_the_meaning_of_artificial_intelligence_system.pdf
    • https://uploads.strikinglycdn.com/files/5c43568a-0b16-401c-bad4-c73a16673c9f/4136343996.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_f3202591ef8f4b67bc83c276496dc1d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f71f208-04fe-4f7b-9513-7ff07bb3a9c5/what_degree_do_you_need_for_supply_chain_management.pdf
    • https://uploads.strikinglycdn.com/files/080d6866-6359-46c6-995a-c0729bcfc4e3/demav.pdf
    • https://uploads.strikinglycdn.com/files/9983aaf0-452e-4f31-88f2-59686ae6ae48/92449773842.pdf
    • https://uploads.strikinglycdn.com/files/045f01fa-414d-492c-9943-6ceb6d8b7fda/what_is_the_average_uk_household_income_2019.pdf
    • https://uploads.strikinglycdn.com/files/831eed27-e5b5-4b1f-af6e-5d44399c032f/what_is_a_jawbone_bracelet.pdf
    • https://uploads.strikinglycdn.com/files/8d7eb9ab-b2bf-46fe-b858-f3f35f3877ce/faulkner_that_evening_sun_summary.pdf
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_ba60d075e97a4f48a39a6e835d082c0a.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_off0000f6dc.bin
bb241ea263dfb106e41ba56c25770927d44eecf8928041752637f7a0a4bdc5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 5872 bytes
font_01_sfnt_off00010aec.bin
4920f540d9a9a01904ff524d6b6d83d5e2964cf11220f17ef88ceb0431a916d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 10844 bytes

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