Malicious PDF — malware analysis report

Static analysis result for SHA-256 211e3efaf0bce274…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 05:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0eb7643690b87c5461b1782060772b04 SHA-1: c858519f87aa8d4dc3bd9b209e27ae5b66a46ee6 SHA-256: 211e3efaf0bce2747ef3ff15775c1375c9cf544779fca7d1c6eac466047d7564
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme to distribute malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating an attempt to obscure the true destination or spread links across many domains.

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 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://maypoin.ru/wix?keyword=oedipus+rex+study+guide+questions+and+answers PDF link annotation
    • http://fusekimutoxi.sportsontheweb.net/78033349096.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/clinical_laboratory_hematology.pdfIn PDF document text
    • http://micrometer25bill.site/what_bible_says_about_marriage_and_divorceyz0f5.pdfIn PDF document text
    • http://getporte.xyz/how_to_get_a_broken_heros_swordtusff.pdfIn PDF document text
    • http://noxezef.iblogger.org/7586975018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_5fd7a5873d6cb.pdfIn PDF document text
    • http://justiciaforjustice.com/interesting_books_to_read_2018441qz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fe9af7e109b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fcbfcb232c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_60299ff6b4e8f.pdfIn PDF document text
    • http://motivawka.online/ts_hall_ticket_2017ax6ob.pdfIn PDF document text
    • http://coupons2020.info/love_story_film_song_video_kannadaujv2l.pdfIn PDF document text
    • http://8bitbeardsco.com/rerenodimobujikudiporbyzk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_c23e13ea43d54e519ca59d3e125db39f.pdf?index=trueIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/zavuwakakegovifobuvimafiw.pdfIn PDF document text
    • http://tapewiwesumufug.epizy.com/discovering_tut_summary_and_question_answers.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_43ba1bfd901649d593b956ed01c7a4e1.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_b47a1aaba2054c188f83a8e1b2b67e81.pdf?index=trueIn PDF document text
    • http://boripodadup.epizy.com/goods_receipt_register_report_in_sap.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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 5512 bytes
SHA-256: dfdb38302ff8e84450073a34eef6d4093338d4edd34c68eb64ab5b51e1edbeed
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10720 bytes
SHA-256: e6cc5777011fcafbd6ff2003dfbd5d95a308451ba78d6fd1b76921df9d6cf2ac

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