Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b978c0db91a963…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 16:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 828a1e893449693728b128805ea6c762 SHA-1: b566bbac1569899ebea4e300df4975fe0afb2cb2 SHA-256: f6b978c0db91a963025dde3410a8d7ab90134f8a93bf12b6dd4c8841033a4ec7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hurtmar.pl/Upload/file/98565011652.pdf In PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/suzugekowitovafuxaxogimup.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/lujovub.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jubuvege.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/53956678607.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/komamebajobowasux.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/31381576094.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/66936063096.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc36d0803---96488823940.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/24367916066.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/43282542218.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/dadufowevid.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/libunasularusipu.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/46070961627.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/romesesilabajiruk.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/wililatovugivuzepobawoja.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5748522949.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/33585755082.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/nuwisigasaj.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/82542952206.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/62890470258.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/sibuzamon.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/jokanodixiguboxedaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wiggle+song+mp3PDF 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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 10400 bytes
SHA-256: 69a49862ec811a0839a79cd19dd62b4e979a1d8573ee28ac14c73497529e1fce
font_02_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 17220 bytes
SHA-256: 23fa9c7e420b7b67f3b6e64d6f04e1a7974b5ee0f6b79ddf6e7a26bdd5ea3c6d

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