Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f9f6234baf22b1…

MALICIOUS

PDF

64.0 KB Created: 2021-02-20 07:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b4ca4405ee4618741ae321e96bccb0b6 SHA-1: 7a671d69613828077e2c0037d1b6e329415f7643 SHA-256: 39f9f6234baf22b17980be5bd730e3457bd76fc0e46692cfeb505248cfcf6f25
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious purpose.

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://jacksth.ru/wix?keyword=rubber+ducky+themed+wedding PDF link annotation
    • http://fajutixosisi.22web.org/brooklyn_nine_nine_full_episodes_free.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/totaredogolowit.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/OvghKhj/nolikamofirevujurix.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/6293556.pdfIn PDF document text
    • http://itwow.info/namoxosm8m72.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/bvChfhg/lesson_teacher_episode_2.pdfIn PDF document text
    • http://pshcomonhere.xyz/daraz_apk_for_android_4._1._2jdnht.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/fgiwGji/podobarukorakozivarez.pdfIn PDF document text
    • http://strgb2.ru/75968581565vbvvy.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/P0rC4jc/62515821198.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/jaQXiaJ/goxaxudotajijan.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/u5jjgjW/troll_face_quest_tv_shows_level_34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemibare.epizy.com/41094491154.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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 5340 bytes
SHA-256: bdc9690fff2450654595a3e62cc05f1f8b0638f093a52a45263db36b462bb07b
font_01_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 9868 bytes
SHA-256: d58a18fa64b808bb9c327e817403d49a4f743dc291672846cfbce9057df37866

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