Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da5e994e738d2a3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-08 09:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e810fbc55e61c102ca1bf64f253de68e SHA-1: 272d58346de71d78302c5721cd65c80fa6269822 SHA-256: 9da5e994e738d2a3e807d2ad72ed68e25067d66416160d06a3ad4eb6de5998be
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=best+colors+for+2021.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://dafemum.ru/strik?utm_term=best+colors+for+2021 PDF link annotation
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/1417052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fcb6ee5d560b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_6026b60f5e68b.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/b7e9ffef1b4e8b.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/XBjglgi/favukokekulutemavewamofe.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/4AwjiKe/at_t_enhanced_push-_to-_talk_compatible.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/6286618.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/depujikit.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/gpidClf/11290955998.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/kJiid9s/fukaralexabuzipaken.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/787e9ed7-bbfe-4528-8d7e-4fb287db0a56/rules_of_multiplication_and_division_radical_expressions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df26cb3-20e8-4b0c-97e1-d6ab84e9d6a5/84305321117.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/tifitoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c303e616-30ab-4bb1-932f-99693c46de35/why_kenmore_washer_wont_start.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/68758830831.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/best_video_cutter_and_joiner_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/30551181515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3556ba79-1abe-4935-b3e2-e58b34ffaba9/can_i_sue_a_family_court_judge.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/58960722775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238bf80d-56e5-43b3-a56b-352a7daef1d1/61769280286.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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5040 bytes
SHA-256: 00192d0545de69c23d89d85f458c08b142572f39690028b700b84465d0ecf315
font_01_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 11364 bytes
SHA-256: 3e98ac1be5687f1d0994fc213b160b91bb98f8ec54a58c53aea20f31996c5f64

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