Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef271d82a31170ed…

MALICIOUS

PDF

72.5 KB Created: 2021-02-26 04:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4bf7ac4317e4533c7d573cbc1626ec6 SHA-1: 2323c1061bf30e3500ea134c5c9fdf91fe2da119 SHA-256: ef271d82a31170ed1d44547be82c88fd158e0a108b8df6ca77b972a6dde4ff83
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru/strik' and associated with a 'practice test' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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=amc+8+2019+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392871/normal_601ed541c97c9.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/b3rjjhh/jekuvimad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fedfb236e095.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/ihyq9e7/dibafitibakutomimox.pdfIn PDF document text
    • http://vkrowl.com/xaraxozakebaropululivophsbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fd5f7b36062d.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Wniijbj/viwib.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/fiii81I/bevaputanu.pdfIn PDF document text
    • http://kelnoteres.xyz/how_many_days_for_priority_mail_delivery8iwwl.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/emcAPs4/unwanted_experiment_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_5fe805ae431f5.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/fcjjfUp/gapebuneriz.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/219192076151szau.pdfIn PDF document text
    • http://axecheat8.xyz/gujomolinuzubt61w.pdfIn PDF document text
    • http://letgtma.bid/685964922991ne48.pdfIn PDF document text
    • https://cdn.sqhk.co/sonometa/ajiBgjT/revawodanirarip.pdfIn PDF document text
    • http://sevastopol.sale/architectural_presentation_sheet_layout_templatesxwez9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5fe877c2028ed.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/khhkXdC/can_i_apply_primer_over_paint.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
    • 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 5284 bytes
SHA-256: 6c57425069a9505a4d1c5b61ddf6088eb8e6c0ea66886a5e4d0167696237904a
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 10772 bytes
SHA-256: 1e460002e4934c01305178fa36a143c62d15f9dd9a995f76332b5eda17cd399f
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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