Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f77f875a2d7b9e7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 06:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0262a29f1f186d975879b6832b7dd3a7 SHA-1: 495730629d28f9f53a1c26d5f3bd553c55b6c782 SHA-256: 0f77f875a2d7b9e7872ba15e50a9c82eec1a1c143abcda39b6a0a9a5530534a0
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 trojan. It contains a large number of embedded URLs, many of which are on disposable or suspicious domains, indicating a likely phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=miga+hospital+mod+apk PDF link annotation
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/29696861231.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/26642405556.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/veneforelituder.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/natomaxakuj.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebeede7dfc---45765044080.pdfIn PDF document text
    • https://termoformat.md/img/files/84373810524.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/vufexukijuxarexoga.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/xojumixuxowulapat.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc232fc6f---nijusojotimilaxu.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zoramejezusuwerixo.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/24112944987.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xuvuraxakonegorujufofuxog.pdfIn PDF document text
    • http://mp-journal.com/media/file/62157503705.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/73158976529.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sunikiw.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/56504538369.pdfIn PDF document text
    • http://kechengchem.com/upload/files/96873061.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/77462309286.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zezopi.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/87194320414.pdfIn PDF document text
    • http://hk-keber.de/images/file/pomigewasarofoxiruzifof.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/bixojetadavasikizujufopa.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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 18676 bytes
SHA-256: 346409de4056698149429acd57560e6688c3a0f8e072c2460d0e2abf856e5e03
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 10588 bytes
SHA-256: 002efac2faeede006a93af31f11846201e6b5846a9cac2cb27f31981bdd360c9

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