Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb26c0b63d7ff393…

MALICIOUS

PDF

95.0 KB Created: 2020-12-31 07:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 10e388536622c6772b10fe771909f67f SHA-1: be53f5e082bda948a9176815f6f44113414f4198 SHA-256: cb26c0b63d7ff3936031d25d2dc3a819a309e1ebca5ec71f9d9e1c4cd913f5ba
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

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://traffking.ru/strik?utm_term=medieval+warm+period+greenland PDF link annotation
    • https://cdn.sqhk.co/bixatavafut/jgignge/rubbish_rap_vocal_ease_more.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/notemutufetapo-tunukoxev-wesevurivupumo-wanedidufewopov.pdfIn PDF document text
    • https://denofunafefu.weebly.com/uploads/1/3/4/7/134750316/bb57a00143d85.pdfIn PDF document text
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/2788301.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/jcTgdhc/28667019068.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/zobizaga_mawavu_gunimuju_dasuzin.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/4b0a6d06ff.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/ifpv1Wk/77010519781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zasepo/algebra_nation_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/zupikudowasur.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/sakeloxifutixeluvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51cc2fb-e97b-4c3b-a6bc-3c18a28c21a5/kunuroparawujegudog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629415f6-f901-4e0c-9f4f-f770c5018d8d/30363403276.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/southampton_maps_and_visitor_information.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/bargello_quilt_patterns.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 4968 bytes
SHA-256: 8d11cfec470b7f8ded7d640a65df99062e9213b7bd3412772b76c2b3d1d3ded0
font_01_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 10820 bytes
SHA-256: 7fd3dd8df04ee4a2fec4a6559e0e535e59b8f38265f8ac10b4e5488b73774e88
font_02_sfnt_off00016099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16099 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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