Malicious PDF — malware analysis report

Static analysis result for SHA-256 b848b0c9f6b9f6a3…

MALICIOUS

PDF

76.2 KB Created: 2021-05-05 17:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 198f258de50403361678c3708110eeb2 SHA-1: a084a3d8531c8dc58a3da621b6d9df28d76fc18f SHA-256: b848b0c9f6b9f6a374af07d36e61897a5b58b1dc3daed7e92e609684313517c0
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 are SEO-optimized and point to seemingly benign documents, but one critical link points to a suspicious URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://nipisod.ru/strik?utm_term=cloud+computing+for+big+data+salary+in+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fd68b8dae678.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/uaSjfic/defy_gravity_prices_durham.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/iigeKid/gsmarena_samsung_a50_vs_a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_600b3edaa8112.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/eibMijR/motorsport_manager_mobile_2_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/c4pjaha/vugadini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/intellectual_capital_reporting_annual_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/hansel_and_gretel_opera_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/xavuduwisunodijewejukopa.pdfIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_0233ebfa41714f9a896ec441f833124c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/35087220936.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/android_17_mir.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/89874912348.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/72875783510.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/adarsha_hindu_hotel_by_bibhutibhushan_bandopadhyay.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_43e5486e0ba24586bec8e1e7d9ab1b66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/what_is_the_default_wifi_password_for_a_netgear_router.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/demelox.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/how_to_fix_screen_size_on_philips_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/84767090641.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 5620 bytes
SHA-256: bd7cbbf2466c7d2cdc6040d5a3e7c6fd79a6405e9d0e267fffe48f4bb9ea2678
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10280 bytes
SHA-256: 9821a9a51cf31f14ae10aeed680d5aba7d34c343fa3a4e9dc8934bc082531354

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