Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ef3a6ea2931d3c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 11:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fedece31d9d2b99288a25d0e227a3b9 SHA-1: 53f101fbe7ea24dc68561ae9fe11eb61a1362e71 SHA-256: 92ef3a6ea2931d3cd4d2e1679a363e5b36fe10da5ed8c8c163bb9b93fcc59f76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://oniceh.ru/uplcv?utm_term=slenderman+the+arrival+apk PDF link annotation
    • https://jackyrouxmethode.com/userfiles/file/nenofiwixawakijelejataf.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/sanazudojidewugi.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/4065972049.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/26042894028.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/89467331691.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/litisazowij.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/89021046387.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/xuxirevewibodanuf.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/50979043054.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/50579168050.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/88225941905.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/sifiv.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/xesutakuxegugosuposomevov.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a248793f9---tizizosote.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/38406149100.pdfIn PDF document text
    • http://elitvorota.ru/f/file/88458936526.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/pezazag.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruborefulobobefadariz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614323433f804---40976740781.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • 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_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 18128 bytes
SHA-256: 469ede97fe6c70c6624890cba649cc026327030e1cf190dd5f3fbfe7b75c0414
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 10604 bytes
SHA-256: b072e3f2aea113de6d22b9a70a50332f233f4cdc03d1d3af73d9e3da607a5bbc

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