Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca82454547b9dcf6…

MALICIOUS

PDF

72.3 KB Created: 2021-01-21 10:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e9589fb5d1bc93f877c8848098786fbb SHA-1: e92d068eef24cc2f0ffe8cfe976f99aaa3095552 SHA-256: ca82454547b9dcf601604e931db32a279bad13663c9dd051edea0a06a9bd41d8
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to a 'cootie catcher menu template free', likely to trick users into clicking the malicious link.

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
  • 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.
  • 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
  • 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://cctraff.ru/aws?utm_term=cootie+catcher+menu+template+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f8eded0e442c.pdfIn PDF document text
    • https://site-1176856.mozfiles.com/files/1176856/jasper_report_visual_studio_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/e4rwkK4/lemebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5fa8ddd439dbf.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/bally_s_executive_king_suite.pdfIn PDF document text
    • https://site-1175777.mozfiles.com/files/1175777/momumiritunefixakovewaxan.pdfIn PDF document text
    • https://site-1236495.mozfiles.com/files/1236495/22568113424.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/kakudegoko.pdfIn PDF document text
    • https://site-1178097.mozfiles.com/files/1178097/45522651421.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/ihgegfq/blaq_tee_freenet_apk_download.pdfIn PDF document text
    • https://site-1197012.mozfiles.com/files/1197012/hotspot_shield_mac_2__84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5fd2dec72fcfa.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/islands_in_the_stream_original_version.pdfIn PDF document text
    • https://site-1237297.mozfiles.com/files/1237297/69041809127.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://kewumexor.epizy.com/huawei_p10_plus_android_oreo_update.pdfIn PDF document text
    • http://mevetilozavasep.epizy.com/11569743391.pdfIn PDF document text
    • http://sifebina.epizy.com/firefox_32_bit_free.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_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 4980 bytes
SHA-256: 179b0b6e496440c6607d90bb461b3dc5b6e6eb981c7a1883ebc926aeb907b44b
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10680 bytes
SHA-256: 7b5fc0efdd853a718d2876efae462b8b580363340d32c8e9eca3ca369899c102
font_02_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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