Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7075ad7a7610b22…

MALICIOUS

PDF

77.7 KB Created: 2021-09-25 23:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 985e43405dac3a58a6522237c1cd145f SHA-1: 7c576d0118caaf579857136528213a4954cd76ef SHA-256: b7075ad7a7610b22b75a6d5f8cf59989a2f3473f1887ad0666e4e0c64cdbefd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a high density of embedded URLs pointing to external, potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=cara+memperkecil+ukuran+foto+di+hp+android PDF link annotation
    • http://vipforiraq.com/userfiles/files/30320640239.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/sadak.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/27439464892.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/35143461690.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/77282989719.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/jabolaru.pdfIn PDF document text
    • http://labsshop.com/d/files/kafilusixa.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/7347225280.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/40197386870.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/26804575154.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/80970685444.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/lafuz.pdfIn PDF document text
    • http://juha.be/_files/file/10605939000.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/27811438091.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/38578140369.pdfIn PDF document text
    • http://devison-matras.com/upload/file/86137359114.pdfIn PDF document text
    • http://btfa.tw/upload/files/bezidi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/zojofipadutawolij.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/nuvelazuxuli.pdfIn PDF document text
    • http://vecsecity.info/editor_up/76557206106.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/25166575221.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/potumoxamipelilo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///navorojinebage.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://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_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 16516 bytes
SHA-256: f62cb9b55bb7bcaf0316c9587094e1608b4bd88a7897857ecbce8d56bbe2c913
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 10940 bytes
SHA-256: be85efd24bf1c5992ea44875cbc98d3fb048e671fa5723183c51c97f211fb9e6
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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