Malicious PDF — malware analysis report

Static analysis result for SHA-256 5939b316a140dbe8…

MALICIOUS

PDF

100.0 KB Created: 2021-03-23 17:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b1f1fd7d5be30d02f200b2f9f3ba128 SHA-1: 4556d533882e1fedd2d632a00875ec03b132f2e8 SHA-256: 5939b316a140dbe88966cb3ff61948e50bfde8430f764a3af4a47619577c9541
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, with one pointing to 'https://kuzutuzo.ru/wix?keyword=nagini+serial+in+tamil+sun+tv+episode+1', suggesting a phishing or content-farming lure. While no scripts were explicitly extracted, the presence of numerous external links and the overall detection profile strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/wix?keyword=nagini+serial+in+tamil+sun+tv+episode+1
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/lideturifavi_nojitekixot_zawavulima.pdf
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fefb515d13b3.pdf
    • https://cdn-cms.f-static.net/uploads/4425237/normal_60246bb8ad407.pdf
    • https://cdn-cms.f-static.net/uploads/4488329/normal_601baa384a563.pdf
    • https://cdn-cms.f-static.net/uploads/4477183/normal_603a2a721f4b1.pdf
    • https://cdn-cms.f-static.net/uploads/4475854/normal_600de2a39d6de.pdf
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6017bcc47a689.pdf
    • https://cdn-cms.f-static.net/uploads/4375076/normal_602aa2ca3caca.pdf
    • https://cdn-cms.f-static.net/uploads/4457281/normal_5fd670e29a4fd.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/fesakizamopezopes.pdf
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/godidojareb-zuzefor-mojajanepet.pdf
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/xurisevunikepijen.pdf
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/4477497.pdf
    • http://mugafopame.iblogger.org/bimebuwogi.pdf
    • https://cdn-cms.f-static.net/uploads/4384325/normal_6031711c4c4c9.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_a30db69b7ea54ccab5f55d336e889893.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6f67c95-6c3d-41ad-b1d2-a3b03fba3596/29237636713.pdf
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_6b014edaf6044047ba892ad3485b4764.pdf?index=true
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_694cdd3282204bc0b862b86e9e1f3019.pdf?index=true
    • http://jixuzokevuj.epizy.com/what_does_the_bible_say_about.divorce.pdf
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_badbe322532c44418072674fa4842c6d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1bfac20-f18b-4ad8-bfc8-c74b61db2c78/senior_machine_learning_engineer_salary_bay_area.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001295c.bin
249c54dcddd0f024ecea453f7150529b183ff386e77b173a69f742da2505070f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1295C 25852 bytes
font_00_sfnt_off0001172b.bin
9555ae2765e1dada124930477f4e97946f3dcbe23b6a9dd13339204c2ce230c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 5360 bytes
font_02_sfnt_off00015d01.bin
b00a0cf0cf330bc3ef0a6908157129763801943e9ee57fb162c517ed2ff08be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D01 10720 bytes

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