Malicious PDF — malware analysis report

Static analysis result for SHA-256 54435546ca23cc1c…

MALICIOUS

PDF

72.7 KB Created: 2021-04-01 21:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 97c5bb2d6fd52a855f8ab673a615b40c SHA-1: 3670c11cd2f7c527dd143e5caa58e87d54f17375 SHA-256: 54435546ca23cc1cbdd11d112d4f8fb74fbd8830dcc37b5b9d40895c96b8698e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, including one pointing to 'https://lozipotod.ru/award?keyword=prova+auditor+fiscal+pdf', suggesting a phishing or SEO link farm attack. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, with 'http://ruvikuvi.mywebcommunity.org/65436231845.pdf' being the first identified. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lozipotod.ru/award?keyword=prova+auditor+fiscal+pdf PDF link annotation
    • http://ruvikuvi.mywebcommunity.org/65436231845.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/90f2d1f2ebdd1c.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/anatomy_and_physiology_notes.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/82473195762.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/xitujosofafebakanowanoko.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/xumuxizimelik_gifonoxipamesil_bedaralaxifex.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/peluwawejurebuvatedidusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2bf4bf1-c62c-4ce7-94b4-1956654e820d/duzixezilisovisomaxe.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/14211099024.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/boaters_license_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c797b221-66a4-48ab-9ab5-a39978f6d89e/what_is_the_role_of_planning_engineer_in_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613cc8c8-7183-4fb7-8f9a-364e4e1603fc/dd_5e_advanced_players_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/fafebavorirono.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/winevaludukogugamasutilu.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/zakitexe.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/46262833117.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/capture_one_12_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/kujotupedabafirutonafaxo.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/fewotopedi.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/74991245390.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/49465801451.pdfIn 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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5208 bytes
SHA-256: dba222ae63b68a8b253590d65c4356a98268fd6139880986e7f8508d1137c2e2
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 12384 bytes
SHA-256: 4c75310cc2a454c8848770d932182965b930bd80e3a9d6ed60785a2c4fe1cb71

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