Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd19a4986d52081…

MALICIOUS

PDF

72.7 KB Created: 2021-10-14 20:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa7ed7a79386b82d4d67c494431b8dbb SHA-1: b5aa5e92234437674eabdfea7f591cfd0a366290 SHA-256: bdd19a4986d52081256136ab7415d449add83bf5420af7ce565fc73c3c00fee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://infrive.ru/uplcv?utm_term=schronce+used+auto+parts PDF link annotation
    • https://cjsc.se/ckfinder/userfiles/files/84108480583.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910212117.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a23217fc88a65a9c7d925c25dc99c35f/desakorazi.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/82737333715.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/zabivagiwawewazovilis.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/tenadimibudazubara.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/37984448978.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/wolodewunulo.pdfIn PDF document text
    • https://bunianco.com/other_files/File/53280362730.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vupakigonolake.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/92567084581.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/55830084055.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/69011281997.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/lodolegulixaduga.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/64545529550.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/14426893183.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/ferepexerutijijefodunimo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/15935509131.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/49631904838.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/53432339269.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/zebofinomigajari.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/23314129107.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/19816645589.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/23550165205.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/wibarimod.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_off0000b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 10648 bytes
SHA-256: cd75eadb12fde090d98b58677537fcf3485fe7a8a8d8411311b6203476f59929
font_01_sfnt_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 17008 bytes
SHA-256: 306bc3eab45badf4ee47f2d51e7a06faf7a371498e1813814314abd53ae35473
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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