Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b9ff5d74f4d12d…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 20:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3dd4de36d0fdfc175d40d15fddfd3f5 SHA-1: 9363489c64e7d5bdfbc5d88c3baf3f6825dbb504 SHA-256: e5b9ff5d74f4d12dc6a2d64ce3e79d83a8c763617b2ab9cdd52744aa3ac6a0cf
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 0.9997

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://golowaki.ru/wix?keyword=standoff+game+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460983/normal_6023d03ad2a04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381291/normal_5ff93d7259c81.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/abnormal_psychology_ann_kring_free_download.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/borifuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_6040f777756eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_60287b68dd8bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_603c241f405fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473052/normal_5fda4b51b5b21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60210ae62abc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5fcd8ff5cc750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_5fd0d501d78c8.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/busas.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
    • https://uploads.strikinglycdn.com/files/4abda114-aeef-4750-9ac2-3eb7119690e0/4176676972.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_4a71f08990024c9987e2e12aa809c911.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81df8dc2-90c8-447c-b604-173b98507f62/how_to_reset_toner_counter_on_brother_hl-l2360dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a849f6-f90a-4704-972a-d97cab5a0d1f/29445308829.pdfIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_3c457578f5094515b20cd4500b721d25.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_e717a42cc96a485a8111ebcf9178992d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb238a54-5e08-452b-af01-f8f1c97f2fb6/sizuzakobilawojavukinus.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/business_english_translation.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 5208 bytes
SHA-256: 1a97085c0d0129dd535aea143c31fa5e8c440c8836c8ae6e2287000e030bfcc8
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 10644 bytes
SHA-256: 876745d39ab1079a2664e3b89138f575b75cb5dc7262679329f83366d3f8e173
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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