Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ad9f9655672541…

MALICIOUS

PDF

75.5 KB Created: 2021-03-04 22:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67091f9b44499f59572b21df90a68911 SHA-1: 310cfe6736617dc7e6c5f7d3f6678bc1dd0e4c61 SHA-256: a8ad9f9655672541371f627e2615077be48659e18980425908421377de9ed9f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains commonly associated with SEO link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=samsung+un60j6200af+won%2527t+turn+on
    • http://kubojep.iblogger.org/nestm_admissions_test.pdf
    • http://pafiwuz.66ghz.com/dogelunuribexuketer.pdf
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/finipukoguwumoperik.pdf
    • https://cdn-cms.f-static.net/uploads/4465557/normal_6019cfe0e44b2.pdf
    • https://cdn-cms.f-static.net/uploads/4472503/normal_6036b20b1f990.pdf
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5fdbb1795b2ae.pdf
    • https://cdn-cms.f-static.net/uploads/4365545/normal_60316ddd556c1.pdf
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/gufosanizus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_fe63b80b7aeb43a2af59573541f543a6.pdf?index=true
    • https://s3.amazonaws.com/posaxugidut/investigative_consumer_report_sample.pdf
    • https://uploads.strikinglycdn.com/files/b4418371-bbb4-46c6-afc9-66cefbf74d5f/how_much_do_you_make_at_starbucks_an_hour.pdf
    • https://s3.amazonaws.com/fadadedezeker/bajusudedutirudipasafiwum.pdf
    • https://s3.amazonaws.com/gotitibekovi/chrome_desktop_sharing.pdf
    • https://uploads.strikinglycdn.com/files/48ca7fb5-de5d-4318-9615-e171d2c375cf/when_do_the_new_season_of_wu_tang_come_out.pdf
    • https://s3.amazonaws.com/gumegulaxi/cavatina_piano_sheet_music_free.pdf
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_30bf89013b7942e7a57d5b9bdea823d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5fc5f873-3348-468f-9e14-894106c03d5a/the_twelve_traditions_of_aa_short_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin
19f7e71f02ed0444450ea5af13a2e93616ac2ccb764e9be66b9ffeacb6e4ce9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5788 bytes
font_01_sfnt_off0000fd66.bin
de94a1bf94da2d7d45ca4a8c11ab6ed5462e53e7fb475eca3a66677b4123963a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10436 bytes

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