Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef8988d413e7bb7…

MALICIOUS

PDF

58.1 KB Created: 2021-09-15 15:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a194f1916809d6d6abd8953f28788ae2 SHA-1: 43943fb98d40aff7656e55f8eea28435958d4414 SHA-256: fef8988d413e7bb78783091dee8cc14cd416bb6d7e1e9ef1aad396734a7ace7f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, with many URLs containing UTM parameters, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8939

Heuristics 4

  • 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
  • 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 https://laborke.ru/uplcv?utm_term=is+77+a+prime+number+or+a+composite+number PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8ff3fe9ca0b46d08852be467681ae2fc/lewawumelababevabobafobi.pdfIn PDF document text
    • https://sergiomauri.com/images/file/7719401575.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16952087997.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_BBDBE32188251435.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-15/20210915171813217308.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/92456642710.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/80122003689.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/58606641480.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/dajidow.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/duxageralewipat.pdfIn PDF document text
    • http://tzsunup.com/upload/75761846215.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/57367745398.pdfIn PDF document text
    • http://riversedgefm.com/files/file/83426683242.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/vasinovitomefanuti.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/77921085763.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/mapevodarimiwabitu.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/lutegipolumobazegir.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/58041823967.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/56791963426.pdfIn PDF document text
    • http://hadt.vn/upload/files/68997094185.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/47436931711.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/tefavexevigufitaxex.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/lunefepepokugom.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/vidajogorikagowir.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed30e6e7af---3321999327.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/japuvibepomipanuxo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 18992 bytes
SHA-256: b0e13eb870033e46f15159a925e7e9242a457ad9a25a68a2dada3f46166853fc

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