Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a371cbcd80072…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 09:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1994be91e7a518c3c82cd8811b72a97f SHA-1: c735406868b989cc8d85636871b24f3468863aaf SHA-256: f26a371cbcd800728517d9cb61b6597f77e984250b1a0e40289add672c0dd2f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lure users to phishing or malware distribution sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=meaning+of+patient+in+arabic PDF link annotation
    • http://accessprecision.com/userfiles/file/mafunoned.pdfIn PDF document text
    • https://fond.ru/userfiles/file/36293601319.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/nizekoxamuki.pdfIn PDF document text
    • http://jawarakreasi.com/file/7227032498.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0640b66984407bd3969cce9d36e79fbf/33030932263.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2ce85255---xibedolejifu.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/77395171769.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/didiv.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/gosanulubulefesisopi.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nobitigedoxijo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/8346490019.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/favekaji.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021092800171873499.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/zebolizukabaxulenoxenedo.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/42768655149.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jabufixinikizedo.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sazudoribavewab.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/65146622271.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/37173524444.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/dujan.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/tilafiwefopijawefanigoza.pdfIn PDF document text
    • http://xn--b1afbmo0alc.xn--p1ai/ckfinder/userfiles/files/geremu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/44067396762.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_off0000ae1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 15308 bytes
SHA-256: 5bbe6d194984a3f1240aeeb25a753c6f40c87e28969b2f31af4d8171b450907e
font_02_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10572 bytes
SHA-256: e3e5bb0d98f8385a5c5d701deb875e791fd1aecacc95a8a0cb4b6a332ccff80e

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