Malicious PDF — malware analysis report

Static analysis result for SHA-256 724d1e3b7c611252…

MALICIOUS

PDF

80.2 KB Created: 2021-02-20 06:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 65c5d52ba312a81f5b7e7cd56d45176c SHA-1: 2400ae34f4e9cd112a4c8e30e25e487062f696b2 SHA-256: 724d1e3b7c611252bbc401a1ce930e8cf67c95acd7d8f1dba1f2b5c0a42278b2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, suggesting an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://bologen.ru/strik?utm_term=remington+700+sps+recoil+pad+sticky PDF link annotation
    • https://cdn.sqhk.co/gigijuke/jRMHshj/pinumuwurowusonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5ff8fa59ba95b.pdfIn PDF document text
    • http://tokigarodam.22web.org/dusokekabilopedavewaxoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/eieSgg8/cannonball_run_record_car_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_601484a8cb283.pdfIn PDF document text
    • http://promoocaoameericanas.com/26326650513teosr.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/xunuvaxuze-jugapukoni-lojokanituw.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/xukufilusawafu.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/f0f154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_602de2bd08378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_601bfb78b406f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_602459531d1ab.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/eQe2i0V/dual_federalism_example_ap_gov.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/JdijygI/tegefilizoxefarinozona.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/16b625a9aa70.pdfIn PDF document text
    • http://hocostyle.ru/how_to_connect_ml-l3_to_nikon_d56005f9wi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasutin.epizy.com/introduction_to_cascading_style_sheets_css.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/xml_formatter_plugin_for_notepad_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/dde_jammu_university_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/capacitance_measurement_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/rawolu.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 5788 bytes
SHA-256: 75091bb86bb1fc843c419229e8f83d221414d13344d7efd31c3a0736e887ed39
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 11468 bytes
SHA-256: 9da9ecfff8f6ec41434de275f790cfb30570503e051c668abb197e48a091622f

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