Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14a2bf0b08675c6…

MALICIOUS

PDF

75.9 KB Created: 2021-04-26 01:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc29bbfc875446dc73567a65ad1fe7e8 SHA-1: 11eaa62704f0ffb05cb8b78c7c9649706eb66496 SHA-256: b14a2bf0b08675c6aec050d37419a249c1fe26fe4a1ee5041e7a2196e1d95e06
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the overall structure suggest the document's primary purpose is to redirect users to potentially malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=homemade+tree+stand+shooting+rest
    • http://dragonflysagewellness.com/the_goal_of_psychology_is_toa6fn3.pdf
    • https://cdn-cms.f-static.net/uploads/4478933/normal_6031de1a7553e.pdf
    • http://qwonder.space/arabic_baby_names_bookrno79.pdf
    • http://fragcups.com/kerimizekaxadenemob7rgd.pdf
    • https://cdn-cms.f-static.net/uploads/4472776/normal_601638ae1477a.pdf
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fe735813fecd.pdf
    • https://cdn-cms.f-static.net/uploads/4459328/normal_606318bccb7a9.pdf
    • https://static.s123-cdn-static.com/uploads/4391899/normal_6007ad7066070.pdf
    • http://snail-case.store/549519906gnayc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/metubevozisul/60486776330.pdf
    • https://s3.amazonaws.com/pegozegi/devexpress_master_detail_report_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/d93d7d76-f60e-4a5a-b7cf-dcc717a7d85a/how_does_finding_your_roots_work.pdf
    • https://s3.amazonaws.com/vetamedisoz/carrying_you_piano.pdf
    • https://uploads.strikinglycdn.com/files/88964915-09a6-4ad6-a8e6-f91a07be9a0a/xotit.pdf
    • https://s3.amazonaws.com/bokelur/povimonogupopen.pdf
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_24d4c19d1c344d648baff6f02aed0d02.pdf?index=true
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_f538df06f4a44d818b7c8f76c52574e3.pdf?index=true
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_18fbaa9310d14bed8a01b6704d86c761.pdf?index=true
    • https://s3.amazonaws.com/tuxexi/lojapugumapoxenibeb.pdf
    • https://uploads.strikinglycdn.com/files/ca1998cf-61f9-40d5-8128-8a29c8e06795/what_tense_is_a_lab_report_written_in.pdf
    • https://uploads.strikinglycdn.com/files/20631f27-3968-49d4-be41-fd768430f7b4/45052430102.pdf
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_e8ff3b0ed6dc40a78c0be1558a5b41ff.pdf?index=true
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_c1a2b6cd44cc49aba0846658e9e90766.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8134c29f-625c-4820-9093-96326e4ce940/rerufidorij.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_off0000ec0d.bin
c848fb359539f5be5e8f8d6da0e891b7cc5432827b92bd526821d71474f4eb84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5168 bytes
font_01_sfnt_off0000fd6b.bin
8f681ceb2458437a4bad64241271c22ba5a17476b440132ef8e7aaef61e7e525		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10596 bytes

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