Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f5c70bdcc05ad…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 04:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0812346f39f468883ba1c6299400da2 SHA-1: 9f153bb084e0ff4c7fa25c652be028eef55fd981 SHA-256: a71f5c70bdcc05adcfa032fb5bd2efa799ed39f016bfc6044fb43bd53d36f012
156 Risk Score

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 an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or content-luring attack pattern.

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://botokaw.ru/strik?utm_term=2003+honda+rancher+350+es+oil+change PDF link annotation
    • http://pakirekugep.scienceontheweb.net/gidifesugufalokomekofepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fce8c561e986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5ff42f4c6120d.pdfIn PDF document text
    • http://popularchoice.space/xudunuzakucl.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/fusionner_supprimer_page.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fde0bcdd0bc1.pdfIn PDF document text
    • http://life-news.tech/mapasiwilomad9mqrs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_601a9f983aa9c.pdfIn PDF document text
    • http://electorat.org/grumpy_cat_30th_birthday_memefid26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5fe75eaa694aa.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/acorde_la_sostenido_disminuido_piano.pdfIn PDF document text
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/7c14a0e63c838c.pdfIn PDF document text
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/9531894.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/jebokizez/emulador_de_ps1_para_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/3748364583.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/coldingham_loch_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/sample_accomplishment_report_on_teachers_day.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/happy_christmas_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/hse_risk_assessment_template_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/ample_guitar_f_free.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_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 5668 bytes
SHA-256: f420ecb1da34e77389191f8a500d6d85c7d35d8e183c908ed29bae4c588079e1
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 10596 bytes
SHA-256: 44170c5ed852e77ed7b2d2e6b6158ce4dc648c7d7be1bc186b7891c0819a883c

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