Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06d77e4b5a4ee92…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 19:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 383278c2d6d1021679ff2e45a7669975 SHA-1: 48b4201aa41b496895cd0337d2eed2b709ef6734 SHA-256: c06d77e4b5a4ee92fd0ee0ea0b5b913188ac180fcffa3ec687d2dad8b6453de3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, suggesting a phishing or SEO poisoning campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://rem-proekt.com/f/file/kizitaxikowoguw.pdf In PDF document text
    • https://norservis.cz/files/files/44778473652.pdfIn PDF document text
    • http://millecolori.it/images/file/tajesiviwexikaxomamata.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902164652.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nokane.pdfIn PDF document text
    • http://hk-keber.de/images/file/dawatovetezipodo.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/suvosodelatigu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/vezutizaxuvimumak.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/60633270151.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/95350665636.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/78988736130.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/2156188788.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/22419818310.pdfIn PDF document text
    • http://na3.it/misc/file/15341870350.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210911062223.pdfIn PDF document text
    • http://canoeing.by/pics/files/dinuzomiginudodukivuf.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/52209542066.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/rikefifizolopemezowu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/38296718307.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b050a3155---rogotafexusobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=number+angel+444PDF 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_off0000bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 16516 bytes
SHA-256: 2b7f2dd600ce738548f888a43a400176d5f191f321a948cdff3ba4659da8c332
font_02_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 10268 bytes
SHA-256: 1286d6322c556d4a082dcd16e01dfe8455b8b661331f443f8b6371b0db622033

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