Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f67967e3831d988…

MALICIOUS

PDF

64.0 KB Created: 2020-11-30 21:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 81fa8f72ac820ad82182b3152674522d SHA-1: 1fc7258d6bb52a0ffb15cf8828333abb72cddebf SHA-256: 3f67967e3831d988596285c813b4fe055980baddef4ee0731308e4719c5090ae
186 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 0.9998

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://traffine.ru/strik?utm_term=song+of+storms+ocarina+tutorial PDF link annotation
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/dewisefewuxa.pdfIn PDF document text
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/vadedilanajaji_movobofetuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_5fbcf4e9da754.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/kazukumupupafo.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/xomeza.pdfIn PDF document text
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/1841300.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/6000245a-9bcb-4723-98ca-cb84b2ff629f/besoxojodizoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7846a52c-f62e-41f1-85d9-d6d42a5a9737/36642878956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116b7ba6-a49e-4364-85db-636687d36c80/40557620980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91242cdf-c797-40ac-9bd5-14d81a53a181/51107959213.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/mefatafazolumuzojik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633481f2-fbe1-4306-8313-d050addc57dc/tp-link_tl-wr1043nd_manual_cz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e956f40-951b-4ee8-b977-2fe8dac2967b/47295494831.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/frostwire_plus_apk_windows.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_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 5304 bytes
SHA-256: ec530ac97a692859900ba6687002be4fa8f86cc90fc34b42e917f7412b7278a9
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 10024 bytes
SHA-256: d2086e6dff45503230a795a33dcc0a01aa411947a75ca657f14088c1bac42f67

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