Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a27b3e74b77c7a…

MALICIOUS

PDF

137.0 KB Created: 2021-03-22 17:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d32561bd4656a4f7f517fd6e0fd76665 SHA-1: 4305a80eff3fcd00c0095208ec62ab3d02405c9c SHA-256: 91a27b3e74b77c7ac805a77e9ebb7a1aa6867873ae5ded3137ce78f7300f6f21
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/award?keyword=definition+of+anaesthesia+pdf'. This URL is likely used to lure victims into a phishing scheme. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing attack pattern. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/award?keyword=definition+of+anaesthesia+pdf In PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/the_most_prominent_word_in_the_bible_for_spiritual_gifts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff2d85e8daac.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/download_campus_toeic.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/topafixipewoduduxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_603ceea9b24ce.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/ejijiYX/analisis_foda_de_una_escuela_publica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fe4ea097ce13.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/JjjijJr/87256656774.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/wood_top_coffee_table_with_metal_legs.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
    • https://s3.amazonaws.com/figidireki/gst_delivery_challan_format_doc.pdfIn PDF document text
    • http://zifopodisinuri.rf.gd/89403289320.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/atom_text_editor_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/tareekhi_books_in_urdu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/alaris_gp_pump_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/jefokuvuzixi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/aida64_network_audit_full.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/how_would_you_define_the_term_public_relations_2.0.pdfIn PDF document text
    • http://xefavab.rf.gd/prescribing_competency_framework_template.pdfIn PDF document text
    • http://kefofasenufumug.epizy.com/tijonupisumew.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/diagnostic_bacteriology_a_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/vitifexokejonajuralakuga.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A880 3504 bytes
SHA-256: 02b9adebfa3de549e57f5261e67613c487177f552449cecacde652a03d3576ab
font_01_sfnt_off0001b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4F1 4788 bytes
SHA-256: 466b89a68ed0a276c7e7bacb4084999a5d1064826597116f73a3314509dea0c2
font_02_sfnt_off0001c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C534 13552 bytes
SHA-256: 3e9fd09934fd81003818299958d8a3d10030391d0ae5d8a5d08685663441139b
font_03_sfnt_off0001f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F12C 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_04_sfnt_off000205c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205C6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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