Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c7b0d63b395d8b…

MALICIOUS

PDF

77.6 KB Created: 2021-04-30 11:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 782ff5c6bfa1eb0efc4d535c628ab09a SHA-1: f929115435116d2d3ecafa2dc78b6bd44c1c78e5 SHA-256: b6c7b0d63b395d8b0b91b9d4f276898d7ceb173901b7a48833a4b4b8b3fff830
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://druttle.ru/strik?utm_term=gluten+free+diet+bad+foods+not+allowed PDF link annotation
    • http://nopezimugabotik.mygamesonline.org/fitobaga.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/7247409.pdfIn PDF document text
    • http://opensalon.xyz/popufonokodivowujirigugbr28.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/2cb22dd92.pdfIn PDF document text
    • http://universal-kirov.ru/fire_and_ice_ski_movie_trailereobdu.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/xivako.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/2d_animation_books.pdfIn PDF document text
    • http://xelowonol.scienceontheweb.net/algorithm_and_flowchart_questions_and_answers.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/28479507608.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/7004b7e.pdfIn PDF document text
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/9fa9e98caae1a.pdfIn PDF document text
    • http://wwbook.org/bupekafe1zdt4.pdfIn PDF document text
    • http://bagadiwep.22web.org/estados_financieros_libro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zininorenedalo.onlinewebshop.net/wuxitovojabudubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8300b849-5bf6-47d3-aea3-931758410a42/lolarap.pdfIn PDF document text
    • http://rufegojokod.epizy.com/call_recording_apps_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35320e0b-b7d9-42cb-8230-ff6d9bbdeb1a/galapogexibel.pdfIn PDF document text
    • http://vixasipa.rf.gd/siwebogew.pdfIn PDF document text
    • http://jozixal.epizy.com/checky_checky_video_song.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 5164 bytes
SHA-256: 916c8d8cfc72f758ad2804286cbc92e8bdbe759a252c0528ee655933c4fed4b3
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10712 bytes
SHA-256: 5bd11a469ffdf0418334746798fc4d4f37188ed208cf9895cbe6b29429ff27b6

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