Malicious PDF — malware analysis report

Static analysis result for SHA-256 5755aed6f26f390c…

MALICIOUS

PDF

91.2 KB Created: 2021-03-16 23:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8005fe42d138b945477b453ec6822c13 SHA-1: d7abe5aa35788ead9a6b16c17b304fe1c3c56e2a SHA-256: 5755aed6f26f390cf9a4d046670a5d0a8f8767f8c0db47fbec25fa14692034b2
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one notable example being `https://seumenha.ru/award?keyword=karmakshetra+paper+bengali+today+pdf`, suggesting a phishing or credential harvesting attempt. The PDF's structure and the presence of many links point towards a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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
  • 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://seumenha.ru/award?keyword=karmakshetra+paper+bengali+today+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428035/normal_60141c15df262.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/jMifhja/thrift_shops_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/cOhb9ii/surprising_facts_about_cats.pdfIn PDF document text
    • http://tuzitiniviwodu.22web.org/bejeraxusawinupideziwison.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_6040e4e731367.pdfIn PDF document text
    • http://jisilasi.22web.org/f_ball_f41_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/Jjbthfa/desktop_background_slideshow_free.pdfIn PDF document text
    • http://lusivemewuza.22web.org/99900139222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5ff20f5d36273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_5fee1d1713791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_604ceaf628710.pdfIn PDF document text
    • http://fegadepekab.iblogger.org/kenmore_elite_smartheat_quiet_pak_9_thermal_fuse_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_79473ffd2d8e4e8a9cbbf4b75df3050e.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_339b49dcc9f6480d89ff6d4f17688c6c.pdf?index=trueIn PDF document text
    • http://ludakijawiku.rf.gd/61764394396.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_207bd8d641e34073a6215d7d7312159b.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_93cffc91266d4a8383cd2d2b5c8ceaf9.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_d20a7d0a9ab848c5ae06c4c83291ae4e.pdf?index=trueIn PDF document text
    • http://wokudalewab.rf.gd/mercedes_c200_kompressor_2003_manual.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 5728 bytes
SHA-256: 00a8fb3f5fcba82a7801360f315faea717ebe8067eff0be13c9771987d5e4c88
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11084 bytes
SHA-256: 9871383b6b451a2125532cd0b26ba2d24caa61c6c8a7b67775466964437ecf76
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 10820 bytes
SHA-256: 782704f07e3f634bdf12edfa535baa474076f36a90e27472e07fae9ee63b6763
font_03_sfnt_off00014999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14999 16068 bytes
SHA-256: 12bdfdd26b42687ed6d6e4673084773943fc64d80ea302008a05158b1f99f3df