Malicious PDF — malware analysis report

Static analysis result for SHA-256 641c168268e5e3cd…

MALICIOUS

PDF

82.3 KB Created: 2021-03-02 00:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a4eb32152905d2785341f24f9746b919 SHA-1: dcedd0f139d640f022cbe61c94a74e479e7bfacf SHA-256: 641c168268e5e3cd99b09ea03619ade4028271fd872d848104943e8b2308773f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://xajibur.ru/wix?keyword=mr+rider+physics PDF link annotation
    • http://azakalaza5.xyz/hornady_175_gr_eld_x_7mm_rem_mag_load_dataev6fm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5feed0dbd5af8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454999/normal_5ff56602e2379.pdfIn PDF document text
    • http://maddot.space/black_acrylic_sheet_philippinest2t6r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5fe756b966ed1.pdfIn PDF document text
    • http://robertferrell.net/wesiwenedkarci.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368731/normal_5fefa11b69793.pdfIn PDF document text
    • http://silvanozito.online/happy_new_year_worksheets4zkxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_603ab277b83ec.pdfIn PDF document text
    • http://probmake12.xyz/tojixr7ygs.pdfIn PDF document text
    • http://ig-mediateam.net/libra_shqip_freeqt860.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/bojikov_zatemotixaripod_nazagefabakev_guneravafawir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_6003945fcae0b.pdfIn PDF document text
    • http://help-nanny.site/oxford_english_dictionary_offline_app_download51urg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamopikubo.epizy.com/free_antonyms_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://bilazuwabipuz.epizy.com/vunoditaxofe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 5024 bytes
SHA-256: a124586f839f413c237364c1a6b2d80d96ec3bf52bd0d4e0e6849fd1eda37fd0
font_01_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 10372 bytes
SHA-256: 9b0f84848ae78edf52312ef42d67f4f4af6045807bc36381d1455da856bebcc4

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