Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf9d3520c118815…

MALICIOUS

PDF

72.3 KB Created: 2020-11-12 16:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80ee2b91b972182fd0cb85000305fdaa SHA-1: f85ee51536b3d41b91942409fa0012d6f2662ea5 SHA-256: ebf9d3520c11881549107b442ce362afa5da4ce765c5aed5f87cb6814c245e2f
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 0.9997

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 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://trafficel.ru/strik?utm_term=teorema+de+chebyshev+ejercicios+resueltos PDF link annotation
    • https://fetarulezi.weebly.com/uploads/1/3/4/4/134487317/larezij_jejudipovab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f8b8412e1e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f990839b105e.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/2275779.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/zujav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_5f94c0408534d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f92069f724b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5fa1de9e6a54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f8d67a4b65e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_5fad2ec526901.pdfIn PDF document text
    • https://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/fe753c5f1fe6f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f95e09477a79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/61798213139.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/original_oratory_topic_ideas.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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 5508 bytes
SHA-256: eb5751e510722c0c80050d20ba8160610754c2535ab8ecfc892f6d31c0c44092
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 12716 bytes
SHA-256: 47e3904f24d9611750281acc1903c5c8d4127899539b967ee0c7567cac3ec71a

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