Malicious PDF — malware analysis report

Static analysis result for SHA-256 964273d75673a986…

MALICIOUS

PDF

75.6 KB Created: 2021-03-10 08:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba4b683e29985ba69b3de3b31827d0f3 SHA-1: daf47d15605cc174f342da370ed90f5b4064a260 SHA-256: 964273d75673a9865cddb01fcb61dbd56ae18977059758fddafa25027fda87a0
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 to other PDFs, suggesting a link farm or SEO spam campaign. One of the primary external links points to a URL that appears to be a lure for search engine traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=is+high+blood+pressure+dangerous+when+pregnant
    • https://cdn-cms.f-static.net/uploads/4367283/normal_60315efc59ef0.pdf
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5ff15f4b5e947.pdf
    • https://static.s123-cdn-static.com/uploads/4371248/normal_600651103ee48.pdf
    • https://cdn-cms.f-static.net/uploads/4422145/normal_603bfd4243270.pdf
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf4700c29c6.pdf
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fd7cf5da1d9b.pdf
    • http://geminomigokur.iblogger.org/non-_controlling_interest_balance_sheet_presentation.pdf
    • https://static.s123-cdn-static.com/uploads/4371783/normal_5fe32d50f2670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6335bfaf-f3a5-47c4-b788-1111298b2a3e/skilsaw_circular_saw_blade.pdf
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_bb05a1ab0d6847078520da164185dbf6.pdf?index=true
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_e4b5325a8b0a4eeeb3d50f4ddd63d9fd.pdf?index=true
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_20f8112401b14cf5a324def83d42960a.pdf?index=true
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_dc8580cc1cdc45038fac586b9b8bfcba.pdf?index=true
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_85e3bc97f1aa42cf89d857623f78c837.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_eb50dbbd2a984b5b8a99de1c26beadcd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f87b2ec-3b1f-44f3-b123-5e6d36342f46/site_visit_report_format_sample.pdf
    • http://lezujepadu.rf.gd/singer_sewing_machine_quilting_guide.pdf
    • http://wivufakumetewiv.rf.gd/31027619192.pdf
    • http://pisisagul.epizy.com/feserubumilokaxixonavideg.pdf
    • https://uploads.strikinglycdn.com/files/05bd4cf7-7b3d-4748-a491-71c3010798de/85339864404.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9f.bin
3191297cc1d2cf0e60834039c9bfc3e4613f75fe249e1fa227b080414d604ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 5272 bytes
font_01_sfnt_off0000ed81.bin
e11425d49017c714c217455bc4730c305f6b2bace5da77ad36732bd0cc76d360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10920 bytes
font_02_sfnt_off000112bd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 4324 bytes

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