Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb245a9df2aaa46…

MALICIOUS

PDF

75.7 KB Created: 2020-11-14 22:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f2ac7337069849af65a404a6babc6eef SHA-1: d7a569ec93aceb9d4eb088269d1385491174f163 SHA-256: edb245a9df2aaa4638ec2e59db9929da2c572324153b42d7c65db238193a9dfb
176 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. It uses an "enable content/editing" lure. 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 0.9997

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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/strik?utm_term=la+tumba+de+las+luciernagas+espa%25C3%25B1ol+latino PDF link annotation
    • https://depufavekozumel.weebly.com/uploads/1/3/4/0/134017714/7527370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f8fdbb5ac586.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/lokel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f96d635e5721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fae2d27d270f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_5fad7411b5cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f96700f48493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fafdfe395b11.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/c9226ab8-7cc6-4a27-8bf5-2c9d5f99a214/46496671369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db4e318-59af-4e6b-bdcc-1d67044864f4/wigokenegeku.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/a_word_that_starts_with_s_and_ends_with_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098691d6-aaf3-4bda-a746-b602891180da/narelovonabegetiweri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660af5ef-27c5-49e1-ace8-fb3eca2f5731/76756678343.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/chase_arts_and_culture_card_2019_texas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 3560 bytes
SHA-256: 75852632f671e87791f2708312c4759bdd59555cbf9d65b0b21b0f6e0b5329bd
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 5684 bytes
SHA-256: 77cfb1227e2f50087f81db1129db57937689c1a107418385834a38af0a1953aa
font_02_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 11272 bytes
SHA-256: 3cd01d3f7a07ef4afa949dd14a2067bf625e1c13b86ddaefecfa77d4242fac86

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