Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c243b1d68040a6…

MALICIOUS

PDF

77.6 KB Created: 2020-12-22 02:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afb0ab5cacbb6ecbdbbc57cc28c451bb SHA-1: a819b445df04d0ef4f4b709b1128aaf0b3d15ec5 SHA-256: b2c243b1d68040a63d07369c590aafa1abeec7385848a51f78693ef5cb0e5dc9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=emacs+paredit+cheat+sheet
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/288747.pdf
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fc08c8bcf62e.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/b3d2852d439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc714e6c89b935f15e02e5c/t/5fca22ecfedaa13a486aa306/1607082733765/18715433676.pdf
    • https://static1.squarespace.com/static/5fdd37885b7bc966055e0d98/t/5fdd6c3c7185ee572d3266f2/1608346686027/assurance_wireless_lifeline_application_form.pdf
    • https://s3.amazonaws.com/jezekemunidup/cafe_racer_mod_apk_1._032.pdf
    • https://static1.squarespace.com/static/5fce5fd80356d927d7eea392/t/5fd6dcfc7fc52c20693737af/1607916796455/angular_component_template_dynamic.pdf
    • https://uploads.strikinglycdn.com/files/6ee1f00c-c110-4893-9138-e16b23871450/best_buy_wireless_charger_for_android.pdf
    • https://s3.amazonaws.com/saxefi/history_of_wesley_covenant_service_contemporary.pdf
    • https://uploads.strikinglycdn.com/files/4354816c-8635-4b55-804a-b90f0908c83e/57428517467.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfe203c02f22b9dd3811c/1606286882285/51168568913.pdf
    • https://uploads.strikinglycdn.com/files/82a85913-75ce-41bd-9f90-6214e72b4ae1/39525792604.pdf
    • https://uploads.strikinglycdn.com/files/3e190918-ffc4-4bb4-a116-f98a41117104/24263725450.pdf
    • https://uploads.strikinglycdn.com/files/7c832511-7a65-4457-ab29-f24c66c54c76/jamotamalizamejosiwil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd5.bin
f83b01b9eb2454967d93e969fa770ec336f46c65914bb9e3e95a9371adb2b2c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 5240 bytes
font_01_sfnt_off0000ed73.bin
d342781213266bbfb0922acb24c8cbe2e5d9a74363a5c8e4abfc10c023dbf092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 11252 bytes
font_02_sfnt_off00011400.bin
66864dcb3e2b3d6c1a5984d73513acd3e13d902a8b19d386bd2f13f2f58145ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 16220 bytes

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