Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cd7732e88867ca…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 09:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 145a04f90037304e29299c4a564b529d SHA-1: cc45a44850a0aa951a08633c86477472b0de9921 SHA-256: 78cd7732e88867ca741decece95ce181d2d0368ce0dcef6c40838e8160ec43fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the analysis of a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ud-hobby.com/images/Upload/file/kironi.pdf In PDF document text
    • http://ihanzao.com/userfiles/file/20210919123656_1588919690.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/suxixud.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/kirurudapadaforagelo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vujexodojudorusig.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/44609768391.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/derekidupopirapikaviju.pdfIn PDF document text
    • http://yibetter.com/data/files/vomaso.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/64843625813.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/mipon.pdfIn PDF document text
    • http://hmed.vn/upload/files/barugofizi.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/dakowabome.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zikuvodinokoboj.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/47785454192.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/zibatifaseburutesixa.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/17550722956.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/14998269053.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/34367796633.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/gaxasosopebiruwozevajiz.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/58237467536.pdfIn PDF document text
    • http://rsst77.ru/upload/files/10760660446.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/miwigakewopupuwevuf.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/2529212375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=structure+of+cactus+plantPDF 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_off0000af67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF67 17300 bytes
SHA-256: e88a44446f6558fce34a969e58fb8b84fe4062310ccb5901d2472ca2a5115f5e
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10556 bytes
SHA-256: 0e3f26cafcf53489814e463277d33c35543fb6aadecf94e0d5e2c03f44a37144

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