Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e3dd45bf6bd7f2…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 03:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99670f775c3325a5e0ec6b56b90e6b39 SHA-1: 08803000921687575ad4eab61dbeb7c4402e884f SHA-256: 28e3dd45bf6bd7f269903f8cb40a76d92a5cd3741e417f34d7062b604bc15da2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

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://dugedepap.ru/strik?utm_term=how+to+add+a+swipe+up+link+on+facebook+story PDF link annotation
    • http://rukozhop-guide.com/scribblenauts_unlimited_100_guidemt7rt.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/hjiTLpI/dunkin_donuts_coupons_valpak.pdfIn PDF document text
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/xagudugak.pdfIn PDF document text
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/9738356.pdfIn PDF document text
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/5ba715580.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/sovogadu.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/blender_2._79_bagas31dprhh.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/roxumiwigatepur_zeguwiboradisi_badaxibinotode_nosatizevikujol.pdfIn PDF document text
    • https://cdn.sqhk.co/remimuroku/jbgjZie/cnn_politics_reporters.pdfIn PDF document text
    • http://luminar4-download.xyz/17667980937es4bv.pdfIn PDF document text
    • http://brumbum3.xyz/63177538457r2lko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_601922788b3e2.pdfIn PDF document text
    • http://trelon.fun/bikinoga4vsc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_6002dd3147b55.pdfIn PDF document text
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/dipisusapek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5fd9c5feb49b3.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/5e3d78d6-1d29-4c28-a7a8-3d6ca3c21a6a/early_stages_of_acne_scars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0426ba44-1f0f-453b-9629-1f0a4854f5fd/85381695403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e628538-fd0a-4d76-b033-31b1b214cc92/62971702537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6ee99c-3bd5-4b65-b4f6-e7711aae33e1/how_to_set_up_your_teeter_inversion_table.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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 5508 bytes
SHA-256: 49eaf4d185645a733f7f692d31089049acde588e6fa0422d90c18574497f40a7
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11752 bytes
SHA-256: 21c3a9d06e20168c91b688b3c5f07d7653f94df7a6b72428a40aeb1efb67961b

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