Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf53858280412f4c…

MALICIOUS

PDF

79.8 KB Created: 2021-06-04 13:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 47ba39c83858c842b58f0a079485de04 SHA-1: 75e075b7b274539bb6d75c5d6c75ca4abde335de SHA-256: cf53858280412f4c35bd7e1f80fe41de329c377f5b841ba4b01e4e25ba288461
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://wastran.ru/pbw?utm_term=hp+photosmart+plus+b209a-m+driver PDF link annotation
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/dexekiranoketu-fururamupi.pdfIn PDF document text
    • https://voxiranadazezud.weebly.com/uploads/1/3/5/3/135312978/resina-someruwew-xetixagosa.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/legujolose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_6037326d1ed61.pdfIn PDF document text
    • https://wetokusoxuzufo.weebly.com/uploads/1/3/4/5/134508242/2454068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fc80a717f27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_603846a146fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_600e71be161de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_60645c524a192.pdfIn PDF document text
    • https://rukagevilatixa.weebly.com/uploads/1/3/1/6/131608017/d2b78fcd97f.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/f9681823-07fc-47be-903e-45c10767186d/how_to_loosen_tight_trapezius_muscles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e31057-4bb5-431e-8a9f-944bc6f4a373/kotijutokunarim.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/how_does_robinhood_calculate_dividend_yield.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/lavulep.pdfIn PDF document text
    • http://degagogo.pbworks.com/w/file/fetch/144586275/11294257862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af9ddbe-d7f5-46d8-88fe-544d29166173/81557592733.pdfIn PDF document text
    • http://rabopadob.pbworks.com/w/file/fetch/144584601/81098678459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a61b2d-0dad-427a-a162-20ffe7e7d24d/49129752786.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144413610/periodic_table_of_elements_symbols_and_names_quiz.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/pcsx2_latest_bios_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 5824 bytes
SHA-256: c8b7659464691ca645b3407a6b794ac7e9d69cca670616f48fc7719cd48521d4
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 13412 bytes
SHA-256: 90a2be67e8187d03988e93a8a4233750166e544c6dbbba01b1f7abe34ab76c7c
font_02_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 17836 bytes
SHA-256: 740940e5f94a1a06170e7a415f00cee47c3708ccf3b75d0b4203e79918f302f7

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