Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8f73f5d4a73797…

MALICIOUS

PDF

74.2 KB Created: 2021-05-22 16:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fbf99253f0767f153d72fc9aa1faa01b SHA-1: 35edd46df1f28616f697d48b881764aa4dc941bc SHA-256: da8f73f5d4a73797629b9bbca62cb69c9baa46282b78675d8ed396358258f0ce
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dugedepap.ru/strik?utm_term=7.3+proving+triangles+similar+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443357/normal_5ff9cd3cccfe6.pdfIn PDF document text
    • https://nulokoset.weebly.com/uploads/1/3/4/4/134447361/e89d7a6bb69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_601a84ad873fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5ff3afa044cf6.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/naguwilijupaluka.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/ebe9fff092b6.pdfIn PDF document text
    • https://zuduberojep.weebly.com/uploads/1/3/1/3/131398404/wusixutoxobevigazak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_602aa1dbbc2f8.pdfIn PDF document text
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/2271730.pdfIn PDF document text
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/vijedipu-batupimumovij-tinosi-lemaloferiluvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_601f410ed0c66.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/punakimisorilu.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/1fade6724755ee.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/tiniruru/rixevekirajolebexevume.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/monopoly_game_rules_buying_houses.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/what_is_criteria_in_science.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/43086575283.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/far_117_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/96714809434.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/diablo_iii_hellfire_ring_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/zewogirijamataloxafaxutok.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/does_sex_during_menstruation_cause_cervical_cancer.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 5732 bytes
SHA-256: 92a45ea89976fe649630ae991ba24234d6356a8385b6a43ad2145b99e4d14b47
font_01_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 10528 bytes
SHA-256: c27b545d56568cfb7193661e062672c29c341b1bd14b15218348d5a65900f6ea

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