Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b72c62842b516e4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 23:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15769c53e61cf94725747f45486c8252 SHA-1: 1ef391c58ab7891c46910a72ea62f7c3c0d53a3a SHA-256: 2b72c62842b516e40edcad0ceef313645091c9ddf08547f144925c38c93bf1e4
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. The document contains numerous embedded URLs pointing to various domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=android+market+ringtones PDF link annotation
    • http://hzxgdz.com/images/upload/File/koboxovet.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/63941417219.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/44061825961.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///2357886645.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/wozixumufelu.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/26424066691.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/24678668267.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/79388358918.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/56377890421.pdfIn PDF document text
    • http://webs123.com/userfiles/file/29509097928.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/47293346617.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/nuwinobadaripixetulez.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/92566679866.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/pogefezafotonexikewidukad.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/17896899700.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/72189515715.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/befekiwasogemo.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/fedajebafinokala.pdfIn PDF document text
    • http://djapm.com/userfiles/file/wetenobimiparaxap.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/9784134944.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bozumomusedoxagegigonew.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909182028.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zoxobafebejuru.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/13556034904.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 10616 bytes
SHA-256: c86ff0d57c429b54be877d842855a6ae3f8a0a265d3d792e12597621492e115c
font_02_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 18284 bytes
SHA-256: 78f90d7b9e5dfc0dc67f32987176af17abdef0158a3797ac6473fdbf09a38da9

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