Malicious PDF — malware analysis report

Static analysis result for SHA-256 a229b064b13f3c51…

MALICIOUS

PDF

75.3 KB Created: 2021-03-13 18:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86989d1abe168bab93dbe649c18f8cd1 SHA-1: 240f348077c007c19874b22be4ccc22d5f51bddd SHA-256: a229b064b13f3c5161a32abb4be98d432db6127db09b35a4cb2b83b0ba09dbc2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious or SEO-farmed content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=glory+of+the+ulduar+raider+achievement+guide
    • http://static-start.top/3535138994kz1u7.pdf
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/fefow-dinodope-pazijuj-wikik.pdf
    • http://nukicew.xyz/6190142086203ehw.pdf
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/2829637.pdf
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/mizesuw.pdf
    • http://teagreen.space/dovosowe9f9t.pdf
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/80a9b1.pdf
    • http://excschool.ru/financial_accounting_past_questions_and_answers5eiqh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_ef99d4c15cc24a5fb39aba1314b6cab3.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_4cf68bceabc2452bb446cd8ca1ab7784.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4ea9c054-baee-4100-8b21-52764566971d/what_is_the_latest_version_of_the_eagle_scout_workbook.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_7f4fa70f667944468d158275452cc531.pdf?index=true
    • https://uploads.strikinglycdn.com/files/921e3185-0ef6-437c-8475-bfadac327a83/casio_g_shock_ga100mb-1a.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f1ff1424dcda49698e1523150c0a6e86.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4127d9a9-9ae2-41d6-ac9a-b6df6050ff0d/apa_format_essay_example_2020.pdf
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_8e460cf7cdc5430ab1825390607ece7c.pdf?index=true
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_f4228f2c533745398db2b8fc89da417c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f81a26aa-ce5c-4c21-aee9-843986deba9b/donusenetawagadivetuka.pdf
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_f5e2181c251f4b8f9c8266e5e07f7b0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b1b40aa2-f1e0-4c7f-9972-5f8dd36829d8/36005326270.pdf
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_0d1c1591673f44088817dc627050d561.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_94dcbc9383bb4e699256295ed916e986.pdf?index=true
    • 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_off0000e79f.bin
0d7c064987b2e1ca2e9540a5e08bfc82a70fb1e034ecf2509170fd959e343089		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 5448 bytes
font_01_sfnt_off0000fa16.bin
bbd695b7dbce419e63a760b4acea72796c4d361efcf0ccc8deb1cb9aef64a2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10780 bytes

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