Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4ddff314694b17…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 19:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d8d0b3e605a8fb34dce275f99ff1637b SHA-1: 435c0efb0126a342eb2ada2e9d31d7940fd16fb0 SHA-256: 3b4ddff314694b17bed15f72add3f153bcb07f8fd01431a0fb5cf9329bc31fbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smartcirclegroup.com/userfiles/file/sojepi.pdf In PDF document text
    • https://hotelgaric.com/upload/datoteke/pavuridemirasudon.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/nilagoxovixu.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210908052422.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/jazamurunidileraliboriv.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/xuvosuvumagurikexeza.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/piwas.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/lilemenoborozapusotixadi.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/91309309593.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/22440572881.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfaef875a9---roviru.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/jerolulopemipenudikitol.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/vilitivibiv.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/27869576803.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/rasiragamizaniduro.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/63193590602.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/rogadusazon.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/bekijoreleja.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/93226945342.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/96940631440.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/wagexitalevifirapop.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcba6b2119---sojuziwidejana.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/83702861044.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/bosafokinimezofun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kimetsu+no+yaiba+movie+full+movie+freePDF 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://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_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16072 bytes
SHA-256: ea357f97f7e184a8895bc36e9c32663c17bd6aab8af97631782ba8668a7fcede
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10788 bytes
SHA-256: e0f6201d3fa866e0a1f2a8bd715db81af0b69d7d51b8342b86c17f8b4d4ec098
font_02_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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