Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39088f518f8f06a…

MALICIOUS

PDF

86.0 KB Created: 2021-04-01 16:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae7743b5a70b46bb29f3442c117d8122 SHA-1: 594a0cbe4c9b1b460876cbdbeb9443c9233e0a5b SHA-256: e39088f518f8f06a86f3eb04292005935d74e553be5c48c1c2bb5ac72de3622f
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://jacksth.ru/award?keyword=tratamiento+retinopatia+del+prematuro+pdf PDF link annotation
    • https://cdn.sqhk.co/delopomixaba/jhdEE88/top_hits_of_the_90s_australia.pdfIn PDF document text
    • http://albl.ru/past_simple_past_continuous_exercises_online_perfect_english_grammar7fd2u.pdfIn PDF document text
    • http://hookup750.website/kofanenemufuvapefexopepu2mwkt.pdfIn PDF document text
    • http://liolika-rsya.ru/keritaxiewazx.pdfIn PDF document text
    • http://vinograd.io/72445457943pw4hm.pdfIn PDF document text
    • http://lewoluxadet.iblogger.org/82109520845.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/WShfjjE/funny_animal_videos_clean_try_not_to_laugh.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/GgcjiPp/fingerboard_game_basketball.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/jgiQMic/wejufuwefufewoli.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/XUheijn/zusukezelurorarekixoj.pdfIn PDF document text
    • https://cdn.sqhk.co/fifusaji/jgf3RMv/fufapona.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/gfHjhgd/77698469406.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/f4jazMG/okra_project_instagram.pdfIn PDF document text
    • http://peuer.xyz/50478466394t91u0.pdfIn PDF document text
    • http://kulokozataxat.22web.org/email_newsletter_template_html.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/63eb2056-b5df-4c55-8818-99ce93f52304/sat_prep_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9610b577-476b-4455-92d0-24e6f2fcb09f/53705135253.pdfIn PDF document text
    • http://gekasudevij.epizy.com/sirovich_introduction_to_applied_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcda1939-86f7-4c38-9487-af9f5c6d3ae2/12_piece_survival_knife_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2ed05c-4401-4775-9c4a-3354da882817/how_to_reset_a_digital_kitchen_scale.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_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 4956 bytes
SHA-256: e115e2a4799267a8af27742b4ddddd6bec5edff8a3916ecf291ac5f802660fac
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 11824 bytes
SHA-256: dd148ffa23a0b116fb5c9168f91ade6187bf57ab26675ca4ec42ea7ac27900fa

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