Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efefba4891b0d25…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 16:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 481d2f5a7472a0b68d85cdef7d24cf80 SHA-1: 838db1ea361efc1940cc8bc9b67860aa383773a9 SHA-256: 3efefba4891b0d25309e39737c40889682fd60b4308b71d3c9966b45ff866fff
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 0.9996

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://midufefew.ru/wix?keyword=ultimate+guide+to+tarot PDF link annotation
    • https://gemegomuzek.weebly.com/uploads/1/3/4/3/134339500/jiparuf_wanojakezag.pdfIn PDF document text
    • http://metalllift.ru/desixitunomakalaj9k0uf.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/9Amug8b/68826185402.pdfIn PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/3142b8329.pdfIn PDF document text
    • http://mnclassis.org/74816017251207kj.pdfIn PDF document text
    • http://interbank.link/sijidugscbh.pdfIn PDF document text
    • http://chategratis.online/bupijaxoxovasunx96jo.pdfIn PDF document text
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/lebatamakafev.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/rebuzoto.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/BW2Ejja/alumbrado_publico_zapopan_reportes.pdfIn PDF document text
    • http://rankingcoach-apps.com/17551716313pqrrm.pdfIn PDF document text
    • http://damvglaz2.xyz/coding_problems_for_beginners_pythonlvz99.pdfIn PDF document text
    • http://alisabor.design/husqvarna_550xp_idle_adjustmentuwq57.pdfIn PDF document text
    • http://dressnbuy.com/14420850897yhn6h.pdfIn PDF document text
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/ludajuf_bever_fudiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_a3b638eacf314349b972325543cae6ce.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_9bd370b997fc4d5d8e150995ac33cca2.pdf?index=trueIn PDF document text
    • http://taditejob.rf.gd/81521011425.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_9a18b15ee6094c9eb65b7eeccdebd396.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_585f4be0f15c46a98cd8bfd85e65b02c.pdf?index=trueIn PDF document text
    • http://vatilibudavelit.rf.gd/android_nougat_burp_certificate.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_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 4960 bytes
SHA-256: 9824211eac851129cec383df772de4c83a4f45f322c8c3dcceade00cab5d0d9b
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 11060 bytes
SHA-256: 4dedfea4426dd541f58bf2bde4894c701d37ad3de172463c95235db11d74cde9

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