Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e706d3cb5527d1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 11:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ddf0cbfe56f4761fbea3cb0d578157c6 SHA-1: 2eb5800a58d4f7859e43ccb0b8fa5495aedac9c9 SHA-256: 77e706d3cb5527d1f5668ded87de8e08299c1c98107cdb8f7a66471787578b87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of 'utm_term=apk+download+windows+7' in one URL and the overall structure strongly suggest a lure to download malicious software.

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80346a573---vugasusufokipu.pdf In PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kawikesuwo.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/35624261934.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/78155090865.pdfIn PDF document text
    • http://sciattella.net/images/file/18686783662.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210901160405_OTUyNDEzNzM1NDA=.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/sivowogidunusumekiwipa.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wowenuzexirawoxa.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/gopafomisukebowuxarudumer.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/tomenuzimodexetegatogexu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/jezoxarulixudaxijofomi.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23072721749.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/71034258658.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xapukimetaxuli.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/53330832452.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/dabaxo.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11313893535.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210907102931_cnrehr.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe15e8c3c---68354492332.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/51621007697.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/zazudugoz.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/98881168066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apk+download+windows+7PDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10264 bytes
SHA-256: a7c1e8058ce05fab52eea1a8580b09391add23811bf26e5b5a571b9067c4f3ce
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 16084 bytes
SHA-256: 89985b0122d8b38a0aef12e5f144c6f68dc65855c854e5fb0229e06aa1656fd8

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