Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42cbceaa9c8289d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 21:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f6604f6c590e07a0f00eda45d985446 SHA-1: df7f1615bc54586d2e1a699e6937d1315891dfdb SHA-256: f42cbceaa9c8289d3d6a6eed5e8001d2335c168f8a85982f323b7fc5c059bb80
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kammed.com/userfiles/file/janabokoxoxepiwuvurakagog.pdf In PDF document text
    • http://rustproofingottawa.com/userfiles/file/10079469907.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/sefuw.pdfIn PDF document text
    • http://lex.tj/img/file/sawetefumitagefebikowatuj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/dulofoga.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/89301511535.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/56646022244.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/02/48246285055.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/piropafezofos.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/40759371910.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/90958803506.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/4666711773.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nakinulonotojogegekevab.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/tevaligusaxixurilupadat.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/5976748377.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/52867692174.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/guzotumozunexurelegibiwiw.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/81471960129.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/lisagetupebu.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/zofatidajejabelu.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210901140957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=strike+force+heroes+6PDF 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_off0000abea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEA 15924 bytes
SHA-256: 8e5b643020a0fbef8afcf33358751ac1b919157b5b87ceb90fa64e30e30ed45b
font_01_sfnt_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 10456 bytes
SHA-256: fe5222cc6e395330cdb5dcc9cf55ae73fdef98d07d8be9c01191edd5fb6bb5db
font_02_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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