Malicious PDF — malware analysis report

Static analysis result for SHA-256 19663268f126b3cf…

MALICIOUS

PDF

76.7 KB Created: 2021-02-19 16:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9380ca0bc36978a4427554a16ce6156f SHA-1: 2d5f54ee1204132ba76eb93cd1528681e1f97c12 SHA-256: 19663268f126b3cf505ed1637c46069d4b9b0916245e349540e63e80f1becbf6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to direct users to malicious infrastructure. While no scripts were extracted, the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/123?utm_term=do+resistance+band+workouts+work In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_601326417fff7.pdfIn PDF document text
    • http://songkfrk.site/levers_and_pulleys_worksheetkdic9.pdfIn PDF document text
    • http://grafoanaliz.ru/chapter_11_cell_communication_chapter_review_answerst40ju.pdfIn PDF document text
    • http://daddytestit.xyz/99551076301j98gm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600a8bec35682.pdfIn PDF document text
    • http://usesoda.pro/22886916086ah2re.pdfIn PDF document text
    • http://asia.kiwi/grid-_template-_rows_repeat_10_1fryg33o.pdfIn PDF document text
    • http://vwwv-avito.online/batman_hd_wallpaper_for_mobilelrcuv.pdfIn PDF document text
    • http://mikrotikwizard.com/gusibekonediwetovezigopus9f094.pdfIn PDF document text
    • http://potolkilife.ru/zesitubzkf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5fffeef13bef9.pdfIn PDF document text
    • http://digitalcalakk1.xyz/cdc_zika_guidelines_pregnancynnnea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601f5e77644a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_6007dee930a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_5fcc1b4ebdc0b.pdfIn PDF document text
    • http://masalev.ru/vw_golf_transmission_fluid_type16st3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fee2af1bdb4a.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/ghehglf/pop_color_coloring_pages.pdfIn PDF document text
    • http://garantiya62.ru/sportspower_15-foot_trampoline_with_enclosure_weight_limit78ue1.pdfIn PDF document text
    • http://brumbum3.xyz/fi_diagnostic_tool_yamahaq0fq8.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/hhggKge/85005918805.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://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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5076 bytes
SHA-256: 583c86415ade1f42069d57fc53e2e6af7cd466c4930a3c16e9cd845b3c4795d5
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 10640 bytes
SHA-256: 3f4bd1f64d68d8de1eff8200bc01edb6434cf942153357a0612311eea6c7a6b4
font_02_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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