Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81ef02504aa971e…

MALICIOUS

PDF

90.4 KB Created: 2021-03-14 08:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6b1079e3aa35026877f98c3fe3435ff SHA-1: 5f7bfcb543bf57a912d7bcd37e45320cef7be26d SHA-256: c81ef02504aa971eb39ca6baf31d5ee3654ac787258d01c2be302582490ff0ef
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://jacksth.ru/wix?keyword=determining+molecular+formula+worksheet+answers PDF link annotation
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/dewivejebutomoleru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_604cff9351373.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/jowonu.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/Kjfigia/langrisser_1_and_2_switch_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/pepitaji/fhinXji/28593126211.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jaHjijc/sebigigebowomekawividuko.pdfIn PDF document text
    • https://taxupati.weebly.com/uploads/1/3/4/8/134891344/28993ce720e.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/famal.pdfIn PDF document text
    • http://jatudoz.getenjoyment.net/autoimmunity_and_immunodeficiency.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/OieieUO/nasebogodoxusab.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/5e_spell_critical_hit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417815/normal_6009137015fc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28be1b9a-bbfc-4e10-8b99-48b460e6caf5/how_to_redeem_pals_rewards.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/buxujafatewimazuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64944be2-c89a-4f3f-bdb3-b6216743617c/nalax.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/90798795807.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/30905519503.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/phenolic_faced_plywood_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/badakawiwogo.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_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 5448 bytes
SHA-256: 4e638b5da0999e6846847a71304dea3afc8018deb0f01041fe3d7ab15a0bd4ad
font_01_sfnt_off000133a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 11896 bytes
SHA-256: b51ddd521d013c198a1f85214ca2a1f3ab43a20d3959f0b5b4d8508ecd48b428

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