Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc989c4ac2cb681…

MALICIOUS

PDF

77.4 KB Created: 2021-03-25 17:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9365a2de8ece9981e4620844f8a791e2 SHA-1: 150a3b8c996cb191db4a97405dc9d4e52b55657b SHA-256: 6cc989c4ac2cb6811a60d1c92076d279b9e7b7a462227c61ea0342e8e499302b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://maypoin.ru/123?utm_term=best+android+virus+protection+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5ffe04ea15575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_603a4452e5d1e.pdfIn PDF document text
    • http://fimukopu.22web.org/isolation_of_fungi_from_soil_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fe3022ebddcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fca7fd38aa81.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/hd6Y8hc/killer_football_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_601bc7109d079.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/jTN9c8c/galaxy_live_wallpaper_for_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_6055bc34344e9.pdfIn PDF document text
    • http://busigexexowo.22web.org/bible_verses_about_repentance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_60209356777c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_603eb17c72cd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7da4a97-86cd-4f1a-b8ee-86c8760e0dc1/research_methodology_in_psychology_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6f73c2-c8f5-47e8-847b-a5a7886b493a/hp_laserjet_4200_usb_port.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_9761a7a08ccf4c1e982ed54df58d2784.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6805138d-b41c-4bf4-a89c-70f8a4179434/vakunodosemegas.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_c99d8eeeeb324c43afd1299a533a53ff.pdf?index=trueIn PDF document text
    • http://radujexoxetapil.epizy.com/singer_model_4562_troubleshooting.pdfIn PDF document text
    • http://xupozivuruvuti.rf.gd/sohcahtoa_story_problems.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_1b18abaf93834c118c24286eac55500e.pdf?index=trueIn PDF document text
    • http://febarodun.epizy.com/how_is_lennie_characterized_early_in_the_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a5ffde-ecfb-4c81-8821-0d7d11e3507f/word_for_extreme_boredom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd95d82b-2a92-4e75-876c-db9d1af79c9e/69319545485.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_6f55e29890594677a156b4db7fdf8336.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 5144 bytes
SHA-256: e426728ff1d8066314cb310c4c5ae8299131bcd95e2152d8b1b17769a764783d
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 10508 bytes
SHA-256: 390761d9d599e47d9d5f4ade6763d6f8deaf4de73a738c6fbfa964d2a966d1ab