Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f16ac81a0b13fbd…

MALICIOUS

PDF

76.7 KB Created: 2021-02-15 14:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 68bf69e9c68c9837e739c4f87beb9936 SHA-1: 0579b678c2fe02c831b983ae928af0e4c78341c8 SHA-256: 1f16ac81a0b13fbd7048cc16dd42e220004e796356794d4c373da160b85548d0
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's designed to redirect users to external malicious sites.

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://jottigo.ru/wix?keyword=more+io+games+unblocked PDF link annotation
    • http://kubojep.iblogger.org/basic_economics_thomas_sowell.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_60171b2bdd6d9.pdfIn PDF document text
    • https://sadupomojafex.weebly.com/uploads/1/3/0/7/130776775/soxizejuveli.pdfIn PDF document text
    • http://geosen.net/long_division_with_exponents_worksheetufudx.pdfIn PDF document text
    • http://hargotel.xyz/pitumebezuwewunuwa82b1r.pdfIn PDF document text
    • http://freshnatur.fun/waneruwapaguxs4a49.pdfIn PDF document text
    • http://bobr.space/10th_compartment_exam_2019_date_sheetw8lcd.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://jajoxutevo.epizy.com/jajelabo.pdfIn PDF document text
    • http://wixevudu.epizy.com/dazemubotilofezape.pdfIn PDF document text
    • http://velevemi.epizy.com/32579821147.pdfIn PDF document text
    • http://porojerosisogu.rf.gd/geometry_dash_chrome_web_store.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5272 bytes
SHA-256: a07b569601e1739233ca06263fd52bd3d0694b0dd774f43a209a767bb08bf357
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 10804 bytes
SHA-256: 5478454968d7e4039c3dfc8a39f6af0da76f9b7c4d2607af39dd4e058b268261
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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