Malicious PDF — malware analysis report

Static analysis result for SHA-256 88211f91cfa2e5a3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 23:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf32ce9a147d3cc2542011864df46556 SHA-1: 9baca0a026a8d0ff2c9807b03c63d1d86ca1b3cc SHA-256: 88211f91cfa2e5a350dfc714269f34f84ce1bfd7c0965bf68645a3bb986bedff
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 0.9996

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
  • 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://soxebez.ru/strik?utm_term=how+to+use+graph+paper+in+excel PDF link annotation
    • http://mosebuzixat.mywebcommunity.org/28062773097.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/346870825.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/epson_wp-4020_printer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_5fea0b396f2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_600b0e3da3e9d.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/zodoxubixetojef.pdfIn PDF document text
    • http://toppiksnack.xyz/social_awareness_program_reportjkd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_602a234d4b570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5ffa940cd2e06.pdfIn PDF document text
    • http://orehi-siberian-force.online/can_you_replace_battery_in_braun_toothbrushyxxin.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/how_to_connect_rock_band_4_guitar_to_xbox_one.pdfIn PDF document text
    • http://fefafumevi.iblogger.org/mekufiwetutulofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6030a5064baf9.pdfIn PDF document text
    • http://zeropium.com/the_winter_of_my_discontent_quotew9h8p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_26244156567b458c8e877353d99b8758.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b2cffe-0361-4bd5-a5ce-07fbe3c9802d/18286609213.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_5e79a56e28f942b59bec1a42ffaf7e29.pdf?index=trueIn PDF document text
    • http://dinixebun.epizy.com/what_is_the_best_kidkraft_dollhouse.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_c3283fd7f8c34638958ca7f83399f9bb.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_63d8a9450fd54e478949d96af7a51a7a.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_aadf052283474ccaaa6cbb8da2f8b2b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d68e3c-883b-4e6e-842f-5b45de2185d6/filozigokofiwexax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 5316 bytes
SHA-256: 1bbf65c30c6cff814c50f93492d425e31985d90a260a5a7039f22bea5250a5c5
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10708 bytes
SHA-256: 58148d7cacda05b4c9b557378ede2be27bbfda967c3fb63a717bb1ae266f5bfc

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