Malicious PDF — malware analysis report

Static analysis result for SHA-256 88180c0093468afc…

MALICIOUS

PDF

113.3 KB Created: 2020-12-10 11:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f4a12371e9e455b0ab8edeabea89dcf1 SHA-1: 913ef94c682b6015500849934e1c5bc474bcdcce SHA-256: 88180c0093468afcb4b4bab6d6e6311b76a1446b1f8061f859a34460b3837761
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=baruch+lab+safety+tutorial+worksheet+answer+key PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kinufijozulof.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/63618dca16b997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f873ca1c4980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fae3945cdbdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf55289d7936484085126c/1606374697282/neil_postman_the_disappearance_of_childhood.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/colorado_dmv_driving_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/famous_biography_books.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/72012815958.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/sujotu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07dde27a199023ab34438/t/5fc15d7208845d0924bd926d/1606507891004/bright_green_water_pitcher_replacement_filter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115d62bbd7406580792b0/t/5fc31b05f8cdb769c6495f8a/1606621957560/wigewozitafixone.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/78050963444.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/forest_lake_synchronized_swimming.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_off00017bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC3 5416 bytes
SHA-256: d6c1adf559b68360bc97edffb947ec6dd4df8d179b22f18eb7133a69f441a242
font_01_sfnt_off00018e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E42 12620 bytes
SHA-256: f1bd5d32e3b38f258b8cfbdea9ce17b93174e9fb95e9111d0f819de615786a21

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