Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b65b7c1377d9154…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 15:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6949851fbb5092be5d8cc53b667840af SHA-1: 8d0dcd1b382110575ca28fb984434a2d07094614 SHA-256: 8b65b7c1377d9154751c0be898d49e9e375cabafec47b91631a0b2a21e78fdd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and the high number of distinct hosts indicate a broad distribution of potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sudaff.com/pics/file/mevexoboratu.pdf In PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/36325868959.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109121310584146.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pefogosugo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/mutezoje.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/29711664824.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/56841680386.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/46111533213.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/nenadutofumikakexux.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/zolewikulojava.pdfIn PDF document text
    • http://ossokahve.com/upload/file/15279801783.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/nezoxeraxekavabubijosad.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/pitikanumunegukekemafizod.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109050904053753.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/dosafejunaxejiw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/51954756416.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/fisukigavorezi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a9c5d2df8608c21b543835439638f150/wedojawavabakige.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/lawupini.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/tizuxonafixezogiw.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wekupomuberenuzonexubi.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8f3ddccf6c64e185a989dbe6737dad70/jarerigizilunegatodomomok.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/mifabekiginiwetadekega.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/29745307062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what%27s+my+phone+number+androidPDF 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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 10992 bytes
SHA-256: b699632b23b4684c97666feae8d659eb03fea27ffac56e9ec3626bdd0ec7e388
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 17620 bytes
SHA-256: 1d136e664b696e6865ffc7de4b19f724e842e50b61e6a9a2b8bcfae2e30e34a2
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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