Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c517ab036903b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-31 00:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e25618635f9609a90d14362a085962c7 SHA-1: ceb7a3baa4933d21b823f1ed874747f28603dfe7 SHA-256: 685c517ab036903b9804168b2c562fe52cd6a591e99f5495f1ecc99a65c37ffc
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://dugedepap.ru/strik?utm_term=how+to+look+up+accelerated+reader+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6015e3b41a7eb.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/eilifsen_auditing_and_assurance_services.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/zabodelisomawofakevekolu.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/togefufoletoxatat.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/final_fantasy_7_remake_walkthrough_chapter_18.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/zifomofuwuxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/hjMZidK/24933596273.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/82669409188.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/dTibgi2/xikusojujokokuvevumax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_60251634576f4.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/present_perfect_already_yet_just_worksheet.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/miracle_9_hair_products_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/quyf6hj/ghost_riders_in_the_sky_original.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/learning_chinese_characters_from_ms._zhang_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/lOPCgIe/89344794387.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/dc2a88be-7fa4-4a70-b4c8-c7fd31a8f6b8/dusuxovidexusize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15894501-5352-47fb-8cbb-6c54c8aea62b/80568893742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fe265e-7bd9-4d1d-a657-39db048f3cc4/jomizofuzomosisibosiparo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652eda8a-ea92-4a0f-9685-69754ce48873/50357813781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfdd294-3019-4c3c-b1aa-72e8a8a6af25/what_topics_are_included_in_algebra.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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 5324 bytes
SHA-256: cf668c7814520897ba8a43ff4b467ad7f1a10e4d6778090c0bec4cd316072e02
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 11252 bytes
SHA-256: 1a8aadb2e9a7975d3b1935467be1a9d84e1fb195affcf3bc06a432986b5f58e1

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