Malicious PDF — malware analysis report

Static analysis result for SHA-256 7950190f5682fcc6…

MALICIOUS

PDF

72.2 KB Created: 2021-03-11 20:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 796e77941320495480d4d69bfbd6bc0f SHA-1: 7448f84ad19f363b5cb2eccdece90bd646549ba4 SHA-256: 7950190f5682fcc62ae4e30cff3bdce4ab791c427c31c4a2c0f3ae7b59ce657d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'East African historiography' and the wkhtmltopdf tool, likely used to generate the PDF for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8129

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://crophysi.ru/award?keyword=east+african+historiography+pdf PDF link annotation
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/nexuse-nanubolefasupi.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/TgcRFPs/8164952937.pdfIn PDF document text
    • http://fredo.run/voxusizm7k8q.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/iiyuV2y/clash_royale_stats_download_windows.pdfIn PDF document text
    • http://mediaverifiedbadge.com/84742827232cn7dm.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/cyhbfTV/org_2021_vip_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/voxoduvi/55ehfIn/lodizevolisapofifawef.pdfIn PDF document text
    • http://silvanozito.online/86936348028ree1d.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/wuwakomojirafome.pdfIn PDF document text
    • https://duzigavejad.weebly.com/uploads/1/3/4/5/134513143/4521301.pdfIn PDF document text
    • http://starconflict-game.ru/34332725489f56nb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupokabimizoju.rf.gd/31193562597.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_8e0960fe77a04e9194a98bf2cacdeaf8.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_bb310f67b3224e8c975b5fd49613123a.pdf?index=trueIn PDF document text
    • http://natidifober.epizy.com/37535208525.pdfIn PDF document text
    • http://pidazedovag.epizy.com/78995942131.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_40aa755e017140bfbb05203a6f4b934a.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_8b6cbf307b944b56b2b025f950b7dc59.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_cc29e89cd64a4ee7ab2c9c22e9cdd041.pdf?index=trueIn PDF document text
    • http://nomulumipal.rf.gd/italian_phrases_for_travelers_with_pronunciation.pdfIn PDF document text
    • http://kexasejuwodeji.epizy.com/wimolimapelusujejefutu.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5444 bytes
SHA-256: 3291868429c23250f91d9e6e4c371549d8c452b9fd29f8945addf000e4cee0c0

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