Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c0cee798ea705d…

MALICIOUS

PDF

87.3 KB Created: 2021-03-29 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db1bda808484faff7c6219b371344842 SHA-1: 95dcce83292d9830817cb9f79f11a9ff551964a6 SHA-256: 21c0cee798ea705daba2e2935789db8b7209f3434aef7b397674a7018cb05cd6
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://dugedepap.ru/aws?utm_term=wildgame+cloak+14+pro+reviews PDF link annotation
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tebulet.pdfIn PDF document text
    • http://sobokapim.mypressonline.com/58834435211.pdfIn PDF document text
    • https://cdn.sqhk.co/sujimipin/GNZXgjj/latest_application_format_in_pakistan.pdfIn PDF document text
    • http://strgb2.ru/194013945615b8z8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_60054d5ce229c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6015d72ea242b.pdfIn PDF document text
    • https://xetudutadoboja.weebly.com/uploads/1/3/4/3/134344850/lagubavoforodewini.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/jabeg.pdfIn PDF document text
    • http://on-arenas.com/fowekemidaleh6uv8.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/rhjBAsT/34650175020.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/wokowex_repiwulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_604601bb49943.pdfIn PDF document text
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/gimasitilu.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/piwevikiridutop.pdfIn PDF document text
    • http://begdas.space/duzirenotvhwoh.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/rumudofijilitupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_4206d1a05f794ed4b896c91960346c45.pdf?index=trueIn PDF document text
    • http://sivikonalijuto.myartsonline.com/vuzinuwulusitukevuteref.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_c7dead62dae3403fbbd95282d2cc6fd3.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_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 5764 bytes
SHA-256: ffc225c4a882a78c88d7b062cb9964c4392d368daf52e1c33ce70acb1f30b444
font_01_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 11064 bytes
SHA-256: e7e5d9cfec88954f9424e4783ffa2422fd1ffc437d0db2474e6858b29b5d3c88

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