Malicious PDF — malware analysis report

Static analysis result for SHA-256 761feca59fe157f5…

MALICIOUS

PDF

79.1 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: 2fb52cb52b54f42eeaaa4ad91d23ca5e SHA-1: ec1058795c31e1be8f2eb9d747e77dd2e8614b8b SHA-256: 761feca59fe157f51633876d2bbfef588e07b9e20514577f37668e32ddcb4156
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • 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://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://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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

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
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10272 bytes
SHA-256: 024240223d6fdf3e4b8cb597aaef29d4b803c52ec38c456fffac236bf6381fd2

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