Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cda58c978be05f…

MALICIOUS

PDF

80.1 KB Created: 2021-04-15 16:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cdc74e024294b8c2f9789a4eb20bc5dd SHA-1: c9fffea3d60e8487a1a060af36e73ca0789d5f5c SHA-256: 69cda58c978be05f9acb85e0ae2a9c6487598f236271900e25968fd88c7bdeb9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=what+is+the+difference+between+bosch+300+and+500+series+dishwashers PDF link annotation
    • http://navalny.design/what_happens_at_the_end_of_you_should_have_lefthhhz6.pdfIn PDF document text
    • http://psylath.com/for_elise_piano5smaf.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/jbgd7ha/nulefafajifamabopilifugel.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/idghgd7/mcat_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jcjiijD/92724679211.pdfIn PDF document text
    • http://luchdobro.site/sufadofozatesomolixge22x.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/IAvREjh/minecraft_pocket_edition_pc_free_play.pdfIn PDF document text
    • http://premial.su/xuwupilonudogufesubewutuybrc.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/b884104e.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/piiWZjj/final_fantasy_8_remastered_xbox_one_walkthrough.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/jeperixoluwu-selito.pdfIn PDF document text
    • https://fejizokifod.weebly.com/uploads/1/3/5/3/135341395/5356521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_eb5741b6c67d44519281f179ad5c7598.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_6b35633189b84837a49a41416123fc5e.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_55b2ad411c884d489d23bed2d4cce281.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_baca9a43ba2142a3bb645272ecde7a23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/038ed37b-3861-4907-8bdb-f75888e63353/sig_sauer_p320_vs_p365_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26187c28-f61b-4326-8920-1bd2a66b1085/panelview_plus_7_standard_1000_user_manual.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_410ee4b18dfc4bd2a1354bc086ef5c9d.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_79ed4906e81441419d2bfa65527c6bea.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_1187535a60744f9a8671eb013f8a99e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d950f5aa-d249-4e6c-a126-38878df6998d/togezoravelilaz.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_d1da235934934221a2d3abf68bbb6075.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 5752 bytes
SHA-256: 8d96d47b13b9bce18e70d6eff34134c4c192a18e9c6e7678620cda36e728c751
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 11224 bytes
SHA-256: 9efa15a0b0118e566864b108d5cd5b527cd3c9f712c79db69827c2de7f22e4bb

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