Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a226384bfed7c2…

MALICIOUS

PDF

78.1 KB Created: 2021-04-07 04:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6de14b475e9db2a8adb532845603f5ef SHA-1: a67035d9ded50f05feb23190d2d750c841cf39cd SHA-256: 32a226384bfed7c2ff49968db7b395e8750a15d1b21b2b570daf1796fe229e69
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=how+long+can+castor+oil+last
    • http://rumukisizupew.iblogger.org/87363089405.pdf
    • http://fiwisud.getenjoyment.net/ge_universal_remote_codes_for_vizio_tv_cl4.pdf
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/rerujusumi.pdf
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/mozerikimatafiv-rinidakug-xexanutujama-timozed.pdf
    • http://copyrightsupporteds.com/libro_de_auditoria_operativari96c.pdf
    • https://vezulapas.weebly.com/uploads/1/3/0/9/130969209/lojaxibagaben.pdf
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/kadom.pdf
    • http://liseveziko.iblogger.org/libro_bardo_thodol.pdf
    • http://idealicaitalia-ufficiale.site/pocket_rosary_guideqna7y.pdf
    • https://bidexofuv.weebly.com/uploads/1/3/4/5/134591004/zojemub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_b34f5882059448cfad607ddbe902b403.pdf?index=true
    • http://jimeroxivekafos.epizy.com/59698665796.pdf
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_abc425b0461240b6a825f0ab7d104b4b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2eb3e61f-02fb-497a-b188-27a34239fc8e/flores_del_mal_al_lector.pdf
    • https://uploads.strikinglycdn.com/files/e08ffc55-cb45-4782-8c4d-5e6193fbfe11/which_laser_printer_is_the_best.pdf
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_c477e8b2597241c0ad6236f9eb54a2c7.pdf?index=true
    • http://lojibovel.myartsonline.com/what_are_the_components_of_a_functional_behavior_assessment.pdf
    • https://uploads.strikinglycdn.com/files/58793bb7-b94d-45ca-9d98-11a0279be159/top_10_core_java_interview_questions_and_answers_for_freshers.pdf
    • https://uploads.strikinglycdn.com/files/f8e2280f-5f44-4c86-858f-13cbac1a24c4/busotitigemajo.pdf
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_cfa36d24e99742e2998d5f1072788f3c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5378eec-1d9e-4fb3-bb86-ba5f6b87e434/celf_preschool_scores.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_off0000f26a.bin
519551d493ad30e38c5b62f14b8b87f00791e13345710469a982b53e00038ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5020 bytes
font_01_sfnt_off000103a0.bin
43ffbc6b0ab342bd5418a55eead307f0edb0d3a5e9fbd23ddf187ed26fffd701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 11344 bytes

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