Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3a8ce4df6d568…

MALICIOUS

PDF

89.1 KB Created: 2021-04-07 10:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4f1a911d7f175ce1eca671dc233e0e2 SHA-1: 57bfe82eee24a493add1d4f7249c6cf2aefa4143 SHA-256: 5ce3a8ce4df6d5684dbf3d19767041bf81a32ae624158b7d296898dd7bfa5c46
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=elements+mathematics+12th+class+solution+pdf PDF link annotation
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/1b19ee3bedc4383.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/runavitesekogikogaz.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/fonip.pdfIn PDF document text
    • https://minufagotokuwak.weebly.com/uploads/1/3/4/4/134489045/9705136.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/gomiwetovaduk_fazal_rifiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6041da2c34961.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/cbjcuid/best_hd_movies_apk.pdfIn PDF document text
    • https://fomutifimo.weebly.com/uploads/1/3/4/5/134594787/bigega_segunokafixidox_pubagokoko_tosuge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5fffd2d5d6a22.pdfIn PDF document text
    • https://jarowuvuvam.weebly.com/uploads/1/3/4/6/134614172/bokijego_zaxowake.pdfIn PDF document text
    • https://cdn.sqhk.co/fezajuwu/aOmthdw/tabarovupiwawoxeliribi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowatane.rf.gd/bhojpuri_video_songs_2019_hd_mp4.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_2b6e3a2733dd4428a02bedfb4148c364.pdf?index=trueIn PDF document text
    • http://tutivute.epizy.com/bekiparakilarujusutas.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_222c1ef28fe944c1a9e1587bf5153ff8.pdf?index=trueIn PDF document text
    • http://sumorililuduj.epizy.com/68419964884.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_1fa14f637bbc4ffd94a3e79dc2de9288.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_aa83e4e2e7d648b4952d0ed16321e344.pdf?index=trueIn 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_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 5440 bytes
SHA-256: fe76ed0eee388aaf0c964d12c47426a28cfdef791082478571b2f7b0496784e5
font_01_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 11428 bytes
SHA-256: 1ef952f658334a75bd797708518103cfad3bffb6aae0aa2f1a293aec53fda9ce

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