Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea71d638e7ad109…

MALICIOUS

PDF

82.3 KB Created: 2021-03-04 20:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ee99d69b4f86907094933c562d2fd7c8 SHA-1: cc7bd98ba364b4f5efcdd61e96e9c1c48c732d50 SHA-256: 9ea71d638e7ad109b65b6a50aca0e0ae712b3fe87c40ac133aba5af828ec46b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed for malicious purposes. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution lure.

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://mezovuduw.ru/strik?utm_term=how+to+write+a+presentation+script+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fe79fa1cfe97.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/is_there_a_tennis_game_for_ps4.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/free_autocad_trial_version_download_2011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5fe936af28cae.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/57842680400.pdfIn PDF document text
    • http://dhl-order.info/drive_simulator_2_apk_modgiov1.pdfIn PDF document text
    • http://wisecreditscore.info/rixenasefimp8zmb.pdfIn PDF document text
    • http://betmoy54.com/pisofeve8emdz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fe1f2096f7e3.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/molagokinetalirekijemabo.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/how_to_activate_function_keys_on_keyboard.pdfIn PDF document text
    • http://itali-big.space/milk_and_honey_book_best_poems9131k.pdfIn PDF document text
    • http://olymp-trade.top/sbi_po_bank_exam_question_papers_with_answersr6vsc.pdfIn PDF document text
    • http://senteber.site/daily_bread_bible_study_guidedmpzp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5febe00e6213d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_6016fa0930fcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pidufozu/rosuluzofuditavidusutav.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/is_arbys_roast_beef_keto.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_d6831ff7ceeb4a7bae2ace98d42902d3.pdf?index=trueIn 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_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 5200 bytes
SHA-256: ada909906dd6accedd04046a801b80080c125cba6ff9a7b5531ab1dad1f760cb
font_01_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 10632 bytes
SHA-256: 0a3ee2c762ef515682140d7e9854d204c2e7c7faa41f878c83c3011e8ae69315

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