Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cc2b4a26517e56…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 10:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bb119cfdc92779ef6c32a79b20e52b3 SHA-1: 2c605af271e897da137ed2ecbcb06010e0a737ac SHA-256: a7cc2b4a26517e56d8394b6aa0efdcdc9f104cb2174496070644be9305da2b2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting.

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://bamfieldrental.com/userfiles/file/viworatilaxefujig.pdf In PDF document text
    • http://wxdyzs.com/userfiles/files/suwetigovunidazorukesowew.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xosumarozebes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8432af82---97257868864.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/20900972436.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/56546056596.pdfIn PDF document text
    • http://oilspecchem.com/files/33447554289.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kuwoduturitafelukamiko.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jutarajovaboxidupamavuf.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/bogamabe.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/bixabepumazodaxe.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/megalivuxeluf.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/foriwotifaxozujexafuvanod.pdfIn PDF document text
    • https://laser123.com/geektic/files/92557001410.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161416d83925d1---vidukavovudukaxawadule.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/wofuzobufuvanojidigu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/laretuzolijijofo.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/5636808868.pdfIn PDF document text
    • https://sanagustin.cl/files/83416836157.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/jotarilinebolaxenibipen.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/99889011260.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/45098780897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wallpaper+hd+4k+background+apk+downloadPDF link annotation
    • 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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 18096 bytes
SHA-256: b912ef37d83e5bc5bcea8ba738ef39c420ff6876db0d92597d91023226e87059
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10924 bytes
SHA-256: db91ebbb53c9117a2a727af7f857f1f659e55a6cea5b33d7e755eace56de261f
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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