Malicious PDF — malware analysis report

Static analysis result for SHA-256 341345d5811a45c9…

MALICIOUS

PDF

74.5 KB Created: 2021-10-18 10:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5f32a408531c4b56aab5953ead6cdfb SHA-1: b87f851b08ff08835c344257afe979930b68042b SHA-256: 341345d5811a45c9198e942f518c49941f50c9d651f43c4f4c824b558609267c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's a link farm on disposable hosting, and numerous unknown URLs were extracted, pointing towards a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate malicious redirects or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://dichvugiayphep.biz/upload/ck/files/90255855151.pdf In PDF document text
    • http://spellenindex.nl/images/uploads/47783396900.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/dojizema.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/xalawajudalokuv.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/55039306499.pdfIn PDF document text
    • http://trivio.it/userfiles/files/42394305426.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/72938463419.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/25624225348.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/82588937585.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/59927977310.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911194816674.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/46576834542.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zepegeselumajolejema.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/81238080175.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20211014003728.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/31756741074.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/fagolewisusebamekezetesa.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xuxopu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/65980286700.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/barumuxan.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/66563689014.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/venuwilagusugelaparel.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/63166124390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=isobar+and+isotonePDF 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 17164 bytes
SHA-256: a1df58c539b135bfea9f770f389636e83a61e23b4135c4988c5e8495bb89ae12
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10284 bytes
SHA-256: f669335770b1d19adca235c568ed4ff24fa2c9434409f4fe9a2096d71f55d714
font_02_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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