Malicious PDF — malware analysis report

Static analysis result for SHA-256 8136c88931e7cb9e…

MALICIOUS

PDF

74.4 KB Created: 2021-03-11 00:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1a831bad2d9faa8f01b9c24e3447b2b SHA-1: 158d2ea0e2705f31658ae12a268d4ad9ef40bb8e SHA-256: 8136c88931e7cb9e6465f2bff1e6a6b3431353bdfd86a3dbd987468c17db24c5
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 0.9999

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://vilenefex.ru/aws?utm_term=how+to+fix+kenmore+dryer PDF link annotation
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/kamitobiwegakitogo.pdfIn PDF document text
    • http://trokot-shtorki.online/best_free_budget_app_australiac4u8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5fce41114df12.pdfIn PDF document text
    • https://xodimiteti.weebly.com/uploads/1/3/0/7/130776847/sapadulijewarovubino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_601266ceb9e97.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/946c8e2.pdfIn PDF document text
    • http://detonic-romania.website/47193278607fvpm9.pdfIn PDF document text
    • http://graatorama.fun/big_building_hd_photos6bq7b.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/9671025.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/how_many_calories_in_a_dunkin_donuts_bacon_egg_and_cheese_wake_up_wrap.pdfIn PDF document text
    • http://hellochildren.online/wuragijixipevevhpgry.pdfIn PDF document text
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/9029023.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/91653d02-1210-448f-a83a-9bdccbb8635d/how_to_program_chamberlain_garage_door_opener_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb1d510-b468-4b66-8b00-539b8c98cb0d/31983779332.pdfIn PDF document text
    • http://banitazivi.epizy.com/asian_dad_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfec8255-0d9c-47c1-978b-0bfcc633cfff/jejumoribo.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/panasonic_phone_manual_kx-tga470.pdfIn PDF document text
    • http://noderisaxe.rf.gd/briery_creek_reservoir_fishing_report.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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 4920 bytes
SHA-256: c781144710e2f73ae72b23df318b3608604b16e8adbf4ef206ec00d0bd17ac37
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 10192 bytes
SHA-256: 7537ca83d706d199d24316eca3cadd1f7ea74cbf4440e918d6ae0ed4e47247e2

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