Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1096d9f901dfd2…

MALICIOUS

PDF

87.4 KB Created: 2021-10-07 21:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0678366a8048bc5cbba2e09552a28ccd SHA-1: 58d046d33e0afe994a23b8f512319f93f6508559 SHA-256: 4c1096d9f901dfd277039b2536e285b6fde19a1861f8b8df8e5dcdcab3f1ad86
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm on disposable hosting, with multiple embedded URLs pointing to PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. No scripts were extracted, but the presence of multiple unknown URLs suggests a downloader or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://thermaltrailrace.com/imagini_ws/75089279223.pdf In PDF document text
    • https://sintasyapi.com/img/userfiles/file/4057785054.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/gorogiradagiro.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/kubazanedupozejozedizosed.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/55372545240.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/bifujimoxesarovudep.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/24263573565.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/godifiredeke.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/movidi.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/nofifavos.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/87242643387.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/vimirefizazenabodar.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/nikaruketedamojeji.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/18067031826.pdfIn PDF document text
    • http://maulich.vn/attachment/files/gidipofedomekonikesof.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/85343172290.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/85057763189.pdfIn PDF document text
    • http://falconltd.pl/cache/file/dipemuvubokuloburojof.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wudixekadugif.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/36047736435.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/14301798126.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/30464696647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+turn+off+passcode+lock+on+iphonePDF 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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 21096 bytes
SHA-256: 2558e09dec903b992bcf418b706ba72bef38ec9203f074808626f4eec3eb9ae3
font_02_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 10988 bytes
SHA-256: 2ddcd34d50936c3c6c87e53a7d985d1712570641ef280b35929cbd1405425ccb

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