Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee3ca1e42f71bc6…

MALICIOUS

PDF

71.4 KB Created: 2020-11-17 11:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 815b519551d96e46cfb73e7be9788e31 SHA-1: c157c4b9f1748c2f0a2ccbf145fa638abbfd15bf SHA-256: 5ee3ca1e42f71bc6530e0b64c73db099dca654f12e3832c10b932c10b69e8c38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'scp containment breach 914 guide', potentially a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=scp+containment+breach+914+guide PDF link annotation
    • https://zegexexu.weebly.com/uploads/1/3/4/3/134385137/9241695.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/zafoso-vanikabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_5f920af5e42bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5fa6ada7e99e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f9f5f413a458.pdfIn PDF document text
    • https://wibiwiterudek.weebly.com/uploads/1/3/4/3/134373050/110823.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/sasizobowemegemagij.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/jifamizosowobi-nidowimazegil-januvikef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_5fab990882d38.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://s3.amazonaws.com/matogapibelifiv/nemomuwumodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3910c8-cba1-42ca-a0f3-4bafab682a0a/the_cleveland_clinic_way.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_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 5696 bytes
SHA-256: de7be81f7b09ccc1d802932eedcfd3e2db396e4a29c5597685d8fdfbaf427923
font_01_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 10396 bytes
SHA-256: 1e8b666e02579dba077bf5444f90e3323ee6498e828291a79e8fdb27df1bcc28
font_02_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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