Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca4277a517b7648…

MALICIOUS

PDF

88.9 KB Created: 2021-03-19 08:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 38033fda2e0eb30ab76558e76f0ea081 SHA-1: 2a33bd3b770c07b9d52a17f2cf18ed84ec197089 SHA-256: 8ca4277a517b76488b5c2f7f340984524cbc3393d13a15f3629925fbbc9f36ba
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=cork+to+limerick+bus+timetable+pdf In PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/a13e18e2.pdfIn PDF document text
    • https://cdn.sqhk.co/kojivitew/lYjjjen/bomup.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowepap/hjjgigi/47134618093.pdfIn PDF document text
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/2720552.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/dd6D0tS/strange_world_offline_survival_rts_game_mod_apk.pdfIn PDF document text
    • http://pabixigenived.22web.org/zunebunadosolowuvupab.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/tavebimofenimajiren.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/46007482319.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/ichjBP7/semufotopusu.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/74122439965.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/49307313356.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/eS9hiic/color_by_number_halloween.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/para_que_se_utiliza_la_linea_de_tiempo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/dar_es_salaam_stock_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/90692658791.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/what_religion_should_my_child_be.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/41106451141.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/gmat_sentence_correction_tips.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/70269955349.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_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 5412 bytes
SHA-256: 85cf992c62dece62c5d09c9dad5b9a45f497c8945a43b520af3918268bad083b
font_01_sfnt_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 11840 bytes
SHA-256: f2c731794e6078bb5dcf159d5b9d6668193ff0f867986ab2866ab6dad86871e3

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