Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad62f144f953f31…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 01:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43303ac224e64a9202dc42510775af25 SHA-1: aa179d40417f0343799f470c74eb32b79c626d74 SHA-256: 0ad62f144f953f313f4fd0ffc9e797d392ba95df80736399686f169a833da0e4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the PDF and its numerous external URIs align with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=how+to+see+someone+followers+on+instagram+private+account PDF link annotation
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/33315489741.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zigowadejinowojovugetiri.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45226136626.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/muvixefino.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/difojaluk.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/14548632621.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/68053888338.pdfIn PDF document text
    • http://healthywithhart.com/res/file/loziwedibema.pdfIn PDF document text
    • http://technocom.pl/editor/file/17514520857.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/jipolofereligodanu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/57914509680.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/16107279864.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/mapetigojerade.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/56017279047.pdfIn PDF document text
    • https://teamcode.net/upload/files/xoxajosegilinewurafab.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/4456570380.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/zavibabasozazuxijinakiwo.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///76769970775.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/17229319037.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/gumisafejikizaxediwawiw.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/64219774243.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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 19120 bytes
SHA-256: 68dce036921ffd32fcb08d86ddaae53aff6202dfeeb6d6dd4ec37fc197f1f054
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 11068 bytes
SHA-256: 61b32e320185e1a40dc2975800d45d64336ef640572869be05e0caf25c7632e2

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