Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c9f38cb14ca826…

MALICIOUS

PDF

103.7 KB Created: 2021-02-27 09:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 433a34189e7f614b5c78383bb4760560 SHA-1: bc1a449c12c2d0435180c611e0b076a349848213 SHA-256: f1c9f38cb14ca826fb8c3c81d5ec693d9dfd9f0f288a0ee197b7ed7c8007914b
134 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a worksheet answer key, aligning with a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=snurfle+meiosis+and+genetics+2+worksheet+answer+key PDF link annotation
    • http://floradoma.net/how_to_determine_how_many_calories_your_dog_needszjmse.pdfIn PDF document text
    • http://jetavimazi.22web.org/11709686379.pdfIn PDF document text
    • http://podipotekoi.ru/army_reserve_retirement_pay_chart_2020srhtk.pdfIn PDF document text
    • http://harkateine.fun/7658713787714h3a.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/hdloZpi/luxubesomuzikog.pdfIn PDF document text
    • http://gikilebi.iblogger.org/14911363633.pdfIn PDF document text
    • http://creamwalls.online/android_device_manager_6._0_apk043rf.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/j8zhigj/zajagikadidopimanenub.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/jjwjj0M/zobumedojejizokabotiru.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/0IyBiaS/kagaposopozivateso.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/is_parallel_parking_part_of_the_driving_testiugb4.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/zlAjhig/nomiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawikaginixuxuz.rf.gd/wirefiwavixinubi.pdfIn PDF document text
    • http://fugexumelelada.rf.gd/93488910248.pdfIn PDF document text
    • http://busugotuwege.epizy.com/quadratic_equation_exercise_4._1_answers.pdfIn PDF document text
    • http://kifemulawej.epizy.com/how_to_draw_a_face_for_beginners_boy_easy.pdfIn PDF document text
    • http://matufuw.rf.gd/lelufijanasefan.pdfIn PDF document text
    • http://resaruxowepu.epizy.com/54636267849.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_off00015b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B72 5928 bytes
SHA-256: 13fdcf899aab97a30e81d7bd82deb2e678048dd27183bf2c7ed28f8ca420c0ae
font_01_sfnt_off00016f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F89 9904 bytes
SHA-256: c48c3ba1e08902ee088859b02c12e0954fdc69884045fcaee2139f3c96835d3a

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