Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26dbde758638dce…

MALICIOUS

PDF

75.6 KB Created: 2021-02-23 09:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b37aac70d67c7724c106384375bdaf4 SHA-1: a06d251ce12dbe7d52dfe67fc4ec3dfd79d3a0c8 SHA-256: d26dbde758638dce7b09cb6f8d9d10a3cbf8b872d48154fa52903e0c07ff3fa0
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to educational content ('Segments and midpoints worksheet answers'). No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

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://leonvi.ru/wix?keyword=segments+and+midpoints+worksheet+answers+a%25232-4 PDF link annotation
    • https://cdn.sqhk.co/gagobuniponi/jphfkHs/dj_lucky_song_lyrics.pdfIn PDF document text
    • http://1pokypki.website/7497550458441kus.pdfIn PDF document text
    • http://moreprodukti.com/check_my_upload_speedo7j98.pdfIn PDF document text
    • http://shop-you.xyz/harmony_booster_seat_with_backumjm7.pdfIn PDF document text
    • https://cdn.sqhk.co/julukiporo/eEgVVLo/42352019473.pdfIn PDF document text
    • http://pochta-24.cc/788059702617x1mo.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/mhcPhb3/83401644222.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/f5q5CKc/91658078437.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/6dhdgf7/wenafibigu.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/jjgcgw1/congreve_rolling_ball_clock_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/dygfMT6/78246522184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivotigapux.rf.gd/asus_maximus_viii_hero_lan_driver.pdfIn PDF document text
    • http://luxorofanogefa.rf.gd/remove_duplicate_values_from_excel_sheet.pdfIn PDF document text
    • http://gegokuberil.rf.gd/esri_arcmap_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/battery_saving_mode_android.pdfIn PDF document text
    • http://pasexojubil.epizy.com/listen_to_the_man_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/bejejiwofapelipixomam.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/archery_game_phoneky.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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 5600 bytes
SHA-256: 132f73a81c63039935813dd44d934a39c4137c587fd4cb746cc8a9e8182c6aae
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10260 bytes
SHA-256: 5b8fad81ecc787f74f6bfaf3766d751be10f8bb8d7eadc361ec3c0c90329ad03

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