Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cf5870de190f93…

MALICIOUS

PDF

68.2 KB Created: 2020-11-29 18:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4684521571c1ad2ee680b0b74b5292d7 SHA-1: 1edec474759bcaf8585bb4246d2e844b42c210fa SHA-256: 21cf5870de190f93f2c58f94dd34463f1c566be14aa77f4eaa03203ded1df888
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious or misleading external content.

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://trafffi.ru/strik?utm_term=chick+fil+a+target+market PDF link annotation
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/5060868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_5fb69411ab6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fa00d177ad81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f94dcf13b707.pdfIn PDF document text
    • https://xovatofenutadom.weebly.com/uploads/1/3/4/5/134511467/mivepiru-jomad-jiwagozufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5fc06dd43cba0.pdfIn PDF document text
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/270565.pdfIn PDF document text
    • https://datamabijiremu.weebly.com/uploads/1/3/4/6/134691522/9903379.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/3552168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5fbfc8fbb61db.pdfIn PDF document text
    • https://vutifiruva.weebly.com/uploads/1/3/4/5/134595151/kidivopedifotofazum.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/votawawo/amar_chitra_katha_full_collection.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/list_of_continents_and_their_countries_with_capitals_download.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_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 5088 bytes
SHA-256: ab14abc5e0ac87d5be006e5a657bb261bab75f700eeb09271d847fb85059c47d
font_01_sfnt_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 11088 bytes
SHA-256: aed2b0219fad62955166c7362dec35a4c9024edabbc163f8c20e79e20e332c8d

Open this report in the interactive analyzer, or submit your own file for analysis.