Malicious PDF — malware analysis report

Static analysis result for SHA-256 3466a6aa923cc56f…

MALICIOUS

PDF

76.2 KB Created: 2021-02-16 07:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 157fb106450171f0c6dfd47ab5ce7369 SHA-1: ff5042ccc18580d2df647960b15751cbeccf69e9 SHA-256: 3466a6aa923cc56f3c5d6d85f2d38f85a79ec31ebcc81f68ed96bc699491a941
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=what+is+port+in+ip PDF link annotation
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/defikuluri-molijuni-tagivoze-mirage.pdfIn PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/ae80601.pdfIn PDF document text
    • http://copyrightshelpcenter.com/free_printable_halloween_math_worksheets_for_kindergartend1qve.pdfIn PDF document text
    • http://metazoaapc.fun/alone_status_share_chat_kannada8n3qs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fd096c731ac3.pdfIn PDF document text
    • http://drenajkrasnodar.ru/36699691453bprtn.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/dheeRjg/sand_dunes_golf_course_wi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_602a436041964.pdfIn PDF document text
    • http://vidclips.design/95913423844aq4ks.pdfIn PDF document text
    • http://libertinemodels.com/toxovalexovotojuri4oxjh.pdfIn PDF document text
    • http://boxberry-24.cc/should_i_take_the_day_off_work8pes7.pdfIn PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/zowonebam_sakabegebafiw.pdfIn PDF document text
    • http://hydrofthol.space/carrom_game_play_store4f8qo.pdfIn PDF document text
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/zovurigav-kaduvuzakamo-falopozazamuda-vikufuzafod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 4560 bytes
SHA-256: 886078478f232cc35f37eb0a7d467b30342ac77ddc70aad19a06133d41d21a9d
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10248 bytes
SHA-256: 8f5189e2bf6cb58c953614d2c2e869c28b7478e461c12b49ef0c94eda0d3e18d
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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