Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71b5f82906db2a5…

MALICIOUS

PDF

77.0 KB Created: 2020-11-23 01:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 870cb6b40927605fae60a30fe729ec18 SHA-1: 98badd8421156dfe7161828cc57bc5e4a93b36ca SHA-256: f71b5f82906db2a5fa00d7b1a50ef0ce8b54dbe5a4279d6ecde8a1ec5fe3a30c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffnew.ru/123?utm_term=girl+i+guess+voter+guide PDF link annotation
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3af0492767d6.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/7ba4ece1e.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/d1ee3c84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5f9f3c8cd975e.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/74ee25a2-875c-42fb-a1fb-1ee9bb784afb/strawberry_decorations_for_kitchen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a75753d-315d-412c-b279-6022a725721c/alianna_defreeze_murder_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45957f55-f049-46d7-8f15-b1c48e503143/kedikarojonoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b9f6b1-dff6-421e-b2a4-562cd19a95ef/mesujowajuzaxipopadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/tetinuwuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51086ea3-d292-4000-a55a-5e1e0d0dbe8c/the_narrow_road_to_the_deep_north_matsuo_basho.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_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 3016 bytes
SHA-256: cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 4876 bytes
SHA-256: b0915be76a88af685e3537ecb4983a4832106b7b07fcb2c6750b96f87b6ef6bf
font_02_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 12144 bytes
SHA-256: eda9fd44255b2358efc799160a76aa0b77c20140099a8890dff5d7103cc88201

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