Malicious PDF — malware analysis report

Static analysis result for SHA-256 5378775a7a1046c4…

MALICIOUS

PDF

87.4 KB Created: 2021-04-30 17:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a5dafb14fb6aeaa18926bfbd85c82cda SHA-1: 8969009f7273f4ed563ec4a3b3c810105c744cfc SHA-256: 5378775a7a1046c4d63cf51247a3a346ae9ea5810ae217f62eaa5c7f61afdd80
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 0.9995

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://golowaki.ru/strik?utm_term=the+red+tent+netflix+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500665/normal_60585cfd20ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_603298e06b850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_60165a882e480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5fe064f498458.pdfIn PDF document text
    • http://laulu-go.ru/76414234521mmtrm.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/6851670.pdfIn PDF document text
    • https://kefapadasogimok.weebly.com/uploads/1/3/4/6/134601884/c547e6822e2.pdfIn PDF document text
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/2251885.pdfIn PDF document text
    • http://uose.xyz/wepoparikesivasipujuvamoxc2hw.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/vuganeragifox.pdfIn PDF document text
    • http://usene.xyz/5233299237016wgm.pdfIn PDF document text
    • http://astrohelp.space/movie_hd_latest697c0.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/jalevifavas_varixu_moniroberuv.pdfIn PDF document text
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/vejetaganabono_wiwazebu_xawesafej_jimexu.pdfIn PDF document text
    • https://kaxapajitab.weebly.com/uploads/1/3/4/8/134896246/e58c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_600f8e14522ff.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/ffcf9.pdfIn PDF document text
    • http://apple-fruit.space/vadasakukikeserezkc55.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/zoluwivebiro/82942192688.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/names_of_groups_of_animals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/lookupset_in_ssrs_report.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_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 4832 bytes
SHA-256: 5b643ac764e598eefba5897404717adbc38b038543de3434a8d0fcf72dc511e5
font_01_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 12752 bytes
SHA-256: 7894e4112aa11eeacfc39493944224d2e12afea908bb22cbaab84a5eac62f39e

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