Malicious PDF — malware analysis report

Static analysis result for SHA-256 8951f77d33d5a2f5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 05:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 195080aa891ebddf80f46e6b27f61694 SHA-1: a8ddcaf86681a855d984ff950efe69aa03970625 SHA-256: 8951f77d33d5a2f54c2dbac9f40bf7144b537a83989e3bc5cd32cb71c561a2d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://airzo.net/userData/board/file/80577378361.pdf In PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/vobutuzaxufefimene.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/81309018367.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kotipatamevarugo.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bewapuparudibivir.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c872eda502---85877914728.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/bujapuzujugitukaguxi.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/fujajalu.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/ximawa.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/23774986937.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_832E3CF2D6C163C4.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/80066318225.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/35329319463.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/63039640164.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/17400507707.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/zebik.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/82394017212.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82734432424.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e06728c162495b6cd7b3c8578fa39144/jonawitenokujefez.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/68443547144.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/joresiwupojepusarufiw.pdfIn PDF document text
    • http://humanlitech.com/files/files/63741043443.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tasozuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=payday+the+heist+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 16620 bytes
SHA-256: 35909600bc8a0b7e1154ed6386622e29e93e6d4746bbf583391fd03b8ef94aa8
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10416 bytes
SHA-256: 18849baadf0570b243b72e7ca732020fc42791f56214b60b7ceb3d8b4e59084b
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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