Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcdcad85e33b69c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-22 12:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 295cf3bd7359e8f5696c9279fa391a9d SHA-1: 5e167b0c09c6f86209f7093a2354dc4258b2c7c9 SHA-256: efcdcad85e33b69c6e90a3dc5b3c7542baf3651e710e56b96f48d9753849dbf3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/wix?keyword=pandora+one+free+apk'. This URL is associated with phishing and potentially unwanted software downloads. The presence of a visual download button heuristic further supports the lure-based attack pattern. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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
  • 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://dafemum.ru/wix?keyword=pandora+one+free+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_6046d7ff47095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_6050cce9cf1e2.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/57367679473.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/43003288741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_60298fa77a6f4.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/xafifokobuxarig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_604e8ea67e9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_604b9b25f0277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fdc41c36ea11.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/pijabozufegilejemiwubulam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5fdefd1c02bde.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/faxaxos/55540409535.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/chicken_invaders_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/spells_from_the_greek_magical_papyri.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/bottega_veneta_schuhe_passform.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/crackstation_s_password_cracking_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/does_google_chrome_comes_with_adobe_flash_player_blocked.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/hp_notebook_pcs_-_bios_setup_f10.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/12127812804.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/like_app_video_share_chat.pdfIn PDF document text
    • http://jatugeset.atwebpages.com/berlin_karte.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/choose_the_correct_answer_by_crossing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 4552 bytes
SHA-256: 433ecb9e0af34371b188e87a4999a87f9ba6be347448e82ce26261db2cbfa5c4
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10568 bytes
SHA-256: 9e079ecfd558790d0eec1e0bf7a191c2859a984afc9f5efeb5c134b47938b65b
font_02_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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