Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a936d023cf8a01…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 04:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdf3b254a1cc8bbec26b1bd7d832a1fb SHA-1: b6b0db7a6b5c46fda63b559deb100deb5bd61db0 SHA-256: f4a936d023cf8a01f2b8c7d4fa65208bfd1ca9e689d0dc9479e7655ccef8e7f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure and heuristics point towards a phishing or SEO abuse attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://petukmahaaaraj.com/userfiles/file/wameriposivexuragisi.pdf In PDF document text
    • https://hoya.hr/UserFiles/file/rejukimovo.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/14522682164.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/togoperuve.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/semesofarelanovilop.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61372e18447e7.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/kolelivojusi.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/miwokove.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/supexasanimowam.pdfIn PDF document text
    • http://vhktn.at/images/content/files/fofakofumuduki.pdfIn PDF document text
    • http://plncse.hu/php_data/file/85315048250.pdfIn PDF document text
    • http://104408017.linker.tw/files/xevopunobegu.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xenuv.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fusunegaramegodobos.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/rixovubobito.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/79828625220.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/66674089810.pdfIn PDF document text
    • https://badrivishal.com/media/19805791114.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/55570494844.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4s9i784ljc1ks2btukqr6pela3/suvenuru.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/66647435441.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143e6535e23b---27739883082.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec3b573e3---80652997274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=picsart+apk+freePDF 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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10296 bytes
SHA-256: dcb51c9851e1c23def30fca728f77edb391ab9f1688ecac4ab389f0be2db5ca2
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 17540 bytes
SHA-256: dc9b98b89d2892e65ee75581cf2220dbf5167bddb7f055e6a2e34f299f6318dc

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