Malicious PDF — malware analysis report

Static analysis result for SHA-256 13155dedfdc85e71…

MALICIOUS

PDF

84.6 KB Created: 2021-06-14 13:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ce0530b2408342936eaad24fd993b0 SHA-1: e1f45c48c4a03969cd8fd6aaa4cbe6a9f4abffc8 SHA-256: 13155dedfdc85e719e2fdb59bef9bfb4362128cce09b2242dc64ba9bc48e9259
164 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a link farm, with the primary URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=gt+racing+2+mod+apk+offline
    • https://cdn-cms.f-static.net/uploads/4486346/normal_6033fca0244bd.pdf
    • https://nonaparipito.weebly.com/uploads/1/3/4/2/134265999/pidudinebikenab_bufozijupagedu.pdf
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/d1a3cabb3c.pdf
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5fde5da1c45d3.pdf
    • https://cdn-cms.f-static.net/uploads/4498842/normal_606bede411041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tozuxexap.pbworks.com/w/file/fetch/144656244/how_to_replace_a_thermal_fuse_on_a_kenmore_gas_dryer.pdf
    • https://uploads.strikinglycdn.com/files/9b45380e-908c-4fee-b5d5-564de44229d3/diamond_sutra_chinese.pdf
    • https://uploads.strikinglycdn.com/files/c6968b94-7771-4a11-90d6-b52677a19035/58366508876.pdf
    • https://uploads.strikinglycdn.com/files/41950bf8-7707-46c0-ac87-db3586d2c9f2/dexudowoj.pdf
    • https://uploads.strikinglycdn.com/files/6621eb44-e9e9-470b-9ae8-c744a100ba33/11328763538.pdf
    • https://uploads.strikinglycdn.com/files/6c79435a-cef7-4fb0-ad0d-054cb57d5e00/1020137856.pdf
    • https://uploads.strikinglycdn.com/files/35adb521-c065-4c7c-8b22-3b78c88b5fcb/vitukiw.pdf
    • https://uploads.strikinglycdn.com/files/c28d27fc-58dd-4dc5-b9b7-bfec8ed0029a/selefojinorogo.pdf
    • https://uploads.strikinglycdn.com/files/2a969f3e-154b-45ec-9d95-227c938abefb/dell_latitude_e7450_battery_price_in_india.pdf
    • https://uploads.strikinglycdn.com/files/e81b5fa7-d9c9-4f8b-8690-484693cd6295/la_divina_comedia_pelicula_completa_en_espaol.pdf
    • http://zafasuvolo.pbworks.com/w/file/fetch/144766431/kixenafoveb.pdf
    • https://uploads.strikinglycdn.com/files/e34e8e39-df38-4bbd-9364-344fce4db70f/19621900911.pdf
    • https://uploads.strikinglycdn.com/files/56443759-86aa-4969-8de1-e82d337b0f65/how_to_make_free_music_playlists.pdf
    • https://uploads.strikinglycdn.com/files/fb9d2475-25b8-4865-943e-41e43b180b63/armstrong_ultra_sx_80_furnace_will_not_ignite.pdf
    • https://uploads.strikinglycdn.com/files/b33aded8-0f46-4657-89db-72588819286a/kovuvevelawid.pdf
    • https://uploads.strikinglycdn.com/files/6da953c7-5370-47a3-96ea-1873b18cd442/math_textbook_for_5th_grade.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_off0000f720.bin
7b17d3f38890ffd0567c41c95a4b375905153f424638bedbd9aad081af3d101e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 5524 bytes
font_01_sfnt_off000109e4.bin
519a0add8242c9aad3792be4f74db565469f7485aeed4a0262fa156fedc810fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10972 bytes
font_02_sfnt_off00012f77.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 16204 bytes