Malicious PDF — malware analysis report

Static analysis result for SHA-256 455acec2a4e87100…

MALICIOUS

PDF

66.0 KB Created: 2021-02-10 07:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dac8766cd4e1e8015435eb31b30c539a SHA-1: 99e74db9a1a262f4580d76dd7ed0d3a40965979e SHA-256: 455acec2a4e87100886d73ecd92e5847053247e879de817b7503c41e0737c7b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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
  • 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://crophysi.ru/aws?utm_term=burgundy+formal+dress+long PDF link annotation
    • https://xufanipup.weebly.com/uploads/1/3/1/8/131856619/xupafafu.pdfIn PDF document text
    • https://tarimewisu.weebly.com/uploads/1/3/0/7/130739021/wekojin.pdfIn PDF document text
    • https://rodubimalutavos.weebly.com/uploads/1/3/2/6/132695690/701739.pdfIn PDF document text
    • http://givarixexav.iblogger.org/community_health_action_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/ih7qGgg/48156244437.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/gjgdJRs/93363813493.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/274733.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/firudegix/sheet_cutter_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/gulokaziriten.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/82854024325.pdfIn PDF document text
    • http://konevimojo.epizy.com/76807001051.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/zonojudoziru.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/kamomozorufuxoxojuwewak.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/avery_address_labels_template_for_mac.pdfIn PDF document text
    • http://pabaxekuvo.rf.gd/dajagi.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/what_am_i_riddle_answers_1-_100.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/2929840815.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/workplace_incident_report_form_ontario.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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 5376 bytes
SHA-256: 620c06da0229955e1fbfcabfbd0c8af4e85a9363ace073f88d7fab95eb0a6fd4
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 9768 bytes
SHA-256: 8d750c8b05cc9acfd43650eb186ecb2a91bc307edd91e11de6aeaf61aa0b847d

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