Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e39f269db53463…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 12:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 797103461b83ce6210129fcee2b4f91e SHA-1: e0ab9f6ba61623d78c7dfccae8c42d220b420ae2 SHA-256: c5e39f269db53463e98cd9eda7fd0f2e8c915d8b6ff142c228a9b5101cebbbdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. While no scripts were explicitly extracted, the nature of the link farm and the ML detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osakadentalcare.com/contents/files/84481101445.pdf In PDF document text
    • http://thuonghieutoancau.vn/uploads/files/58917033926.pdfIn PDF document text
    • https://5udua.com/contents/files/lewopufetamu.pdfIn PDF document text
    • https://anandalaya.in/resources/file/58411742654.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/926137044.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908225338_u12gym.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/guxuxokemapijokot.pdfIn PDF document text
    • http://domuran.pl/files/file/51925285596.pdfIn PDF document text
    • http://stroi-sistema.ru/img/gilewi.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vagumugididama.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jasaxuzeb.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/50189034440.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rademebuvabaxivujor.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/43074211578.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/losivezavemesegifurewe.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/barozagakaxilunegow.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/warofezif.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/60878665681.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/wimifezinobufine.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/jedilez.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/20264747714.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f9daf10---gimipu.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/15351582920.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/dibovizefimaluvobixado.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/71380186227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clearing+cookies+on+android+cell+phonePDF 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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 17788 bytes
SHA-256: f0f0c3e42792093401668226c48357e5db34135852a5f59f1278f4300b100dd3
font_01_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 10816 bytes
SHA-256: 5addea3bfdcd11df5b05160813b7b2621ee039eaa10599db96a4d470a8155eaa
font_02_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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