Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a533e99b84a7e…

MALICIOUS

PDF

68.8 KB Created: 2021-04-03 01:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4507c71878d7f7a8bd612b6df4e6ee37 SHA-1: 1e59773608ae1a280ae21aeb4134d592d303968c SHA-256: 139a533e99b84a7e5bc8d590481e7f5898814a8be174348e467addc7f5a7d9f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/award?keyword=types+of+ignition+system+in+automobile+pdf PDF link annotation
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/luputakiri.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/rawok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_6040a625085ec.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/jigudud_kolipegul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fefef5fabae3.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/YjjfhbF/madakutivikak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ffc136296809.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/7271987.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/0ighcif/nike_pro_icon_clash_hoodie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_6033204b97aab.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/free_financial_report_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_600b5db0059cf.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/5164382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d138d576-e872-4930-89d7-9afb77d608f2/merkury_bluetooth_speaker_price.pdfIn PDF document text
    • http://nonetol.rf.gd/betalactamicos_farmacocinetica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b6a075-ffaf-4ded-ad17-71de13264701/76721228511.pdfIn PDF document text
    • http://waxivapisisan.epizy.com/bapoz.pdfIn PDF document text
    • http://domirewuzi.epizy.com/43393173676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6908604-a7b1-4ed9-b90e-2c7b5f183d38/zugosituvoluzubijir.pdfIn PDF document text
    • http://mevuzulutifoxa.rf.gd/how_to_load_staples_in_staples_one_touch_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd1960b-d786-47d4-8f74-75b6da95b553/57697598432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c0dd92-8d03-4f99-bbde-c05fafe617ee/6922707395.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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 5456 bytes
SHA-256: 2651991f1db9e099e311679a63287adef418a8658305c9987c23a92892a5c0d4
font_01_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 10148 bytes
SHA-256: 59582214a80c9b5d10bdbee300cb5dbfbcb98da144a4348974a05bbbd21ff100

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