Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b96390c66f4a1a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 08:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33677ed8930b4fc4678b6dc4aa9b0962 SHA-1: 0e4ac63d18dceb03cd9019cf678f82e339d21ddb SHA-256: f3b96390c66f4a1a19b73ffc4bb671b18947a1cb9740692c06b8c8b683abc5ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to unknown domains and some exhibiting link farm characteristics. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying 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 potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://artc-polymers.com/upload/images/files/bomexujevorin.pdf In PDF document text
    • http://ulv-fogger.es/d/files/7097565646.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/19084647090.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/nejuromibabodij.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/33969292992.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/7295864176.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/zigomuvugelorajam.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/86569409042.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zujimememidusutibojapebaw.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/91436997934.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/mudujudegaduzuve.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/pubukediruge.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/5110902591.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/18109807646137ec203da65.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210913013319.pdfIn PDF document text
    • http://adice-area.com/pictures/files/44725509949.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c016b689da---14073643498.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aed0e9456f---zezidimino.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/44320617393.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/retisotokaxepadewuwite.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/takubepubavepowozaze.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/jugofiwujepefese.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/22188715923.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210913_FF2B2E7C6ECD3DF8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+rpg+games+for+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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 16680 bytes
SHA-256: cf6f69451de9cf391c2666841fcfc7e1639a290de913f9df505e9bff7753f5ef
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 10848 bytes
SHA-256: 28122f7f3165ad79da0ab547c338548bf62eb81ca0e28a867e941c4136a22f0d