Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a86d5ba7ce2c77…

MALICIOUS

PDF

88.1 KB Created: 2021-03-19 05:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51730a4df200c71e19546df467d3e1d0 SHA-1: 824f0fcbde04d916ede906c4e00dd9757e659d3c SHA-256: b2a86d5ba7ce2c7752b3238f1f919b6c1ad0d3ea488c37806877629a7031bc65
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 0.9998

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/123?utm_term=capacitor+and+inductor+example+problems+pdf PDF link annotation
    • http://sazulido.medianewsonline.com/korebepezanixodid.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/tavixoxerusefib.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/train_schedule_of_bangladesh.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/dragon_ball_super_broly_manga.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/99598174089.pdfIn PDF document text
    • https://nevitasez.weebly.com/uploads/1/3/4/3/134305442/mamiguxiratuwereni.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/jbgfc3B/cervical_biopsy_procedure.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/iJJhjbK/kufatasolasemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5fd2420a16631.pdfIn PDF document text
    • https://wewopamutufufo.weebly.com/uploads/1/3/1/3/131398135/lezofowejavuvor-xipikemulewuxow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_60282a025e4da.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/9307356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_6036f7b532a4d.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/gjvShfd/chrome_74._0.pdfIn PDF document text
    • https://lurefeti.weebly.com/uploads/1/3/4/6/134683691/8926248.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/521055.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/zulodosedo_dodilabexitan_poronevukepa_zulaxibifinebu.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/iiQd5hb/zofegigeguguviz.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/fLhhghX/cycle_racing_games_bike_rider_racing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 5416 bytes
SHA-256: b67ec0e025bd9bae0b0e1ed8ba044ef8f78cd304b4b097f215082e5267a89f02
font_01_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 10956 bytes
SHA-256: f3f2f123e95ceaab32be2d7d94a634f910c3116546f3e4540b2b5ac77edc8b9f

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