Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b4683ebe75a8c3…

MALICIOUS

PDF

68.7 KB Created: 2020-12-19 13:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a9dcb3df7862f68f529a05d4e362144 SHA-1: 5b3a7041c3b091ceca1b419a4ff951ef2c5ccd9d SHA-256: 98b4683ebe75a8c3c77bc8670efcf3fc68f61f932783a54a71e9ba05d0492342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a mass of external links. The primary malicious URL, 'https://trafftec.ru/strik?utm_term=diccionario+latinoamericano+de+palabras', is directly associated with the PDF's content, suggesting a phishing or malware distribution lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=diccionario+latinoamericano+de+palabras
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/melifapugute.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lapazofosate.pdf
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/kuwefisowik-fefukevojab-duwak-gaxoxar.pdf
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/3402915.pdf
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/5e844a85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fdd2a692dcd53187f1e8c64/t/5fdd8554c18bd5077c8c705b/1608353108469/certbot-_auto_renew_manual.pdf
    • https://static1.squarespace.com/static/5fc0ba3b0a2757459be1f9cb/t/5fc2be612dd96f591848b76e/1606598241558/weniwidesupusuwaxed.pdf
    • https://static1.squarespace.com/static/5fc50e3cbda9c57a97d8e746/t/5fc562d13f75b166438871c3/1606771409804/79641405929.pdf
    • https://uploads.strikinglycdn.com/files/fcd563de-2197-4cf5-a499-b568c0c71796/xobazobukeruv.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5bc5f8cdb769c6da428d/1606376390155/grammar_practice_workbook_grade_11.pdf
    • https://static1.squarespace.com/static/5fc517815687f52b6b9c42e9/t/5fc602d54e98326c02dfcc87/1606812374227/notice_of_intent_to_impeach_minnesota.pdf
    • https://uploads.strikinglycdn.com/files/d1198d52-3a9d-4954-b37f-1bca63405c8d/guilford_county_inmate_visitation.pdf
    • https://uploads.strikinglycdn.com/files/be7cab36-4abe-46f1-a15d-7c21be05051a/61206809250.pdf
    • https://uploads.strikinglycdn.com/files/e17c21c6-f448-4388-bdec-22ee9c6ca533/64542980725.pdf
    • https://uploads.strikinglycdn.com/files/648c5ca6-3b4a-4643-a2cf-5defd9848539/dirili_neslinin_aments.pdf
    • https://static1.squarespace.com/static/5fc5b2f2c6229360eccdb2d4/t/5fc9b4fb2ae1264a0390201a/1607054588532/vujerituvuladuburoliliru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb5.bin
37dd25ac42a43c0a3f9cc9bdf19927d1d91ccc7d39d5f241745146dba2f4742a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 5356 bytes
font_01_sfnt_off0000decf.bin
c4da8731bc09d44bd3f61e4563d11bd80d9750b92ab9e762935fd0a46dfa8b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 11368 bytes

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