Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4e27243d1d3f3a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-20 18:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 23ac9589fef89798d9d8cb28d20194f7 SHA-1: c18e097f07e1c09d9c3ec2ba452126aa7f8154ab SHA-256: da4e27243d1d3f3a990451727225f331560b1fa0159d266594272c55d7442a93
184 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, yafferge.ru, disguised as a search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=does+samsung+have+disney+plus+app In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_60034d33e5318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fe5cf7a704a8.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/bovasodikukazuger.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/478757541798tbjb.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/jjb4Ujf/86882635722.pdfIn PDF document text
    • http://smallita.space/total_conquest_java_game_free_download4zbwr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489846/normal_6008e445ab743.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/phihjaX/xosotapowifupe.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/lodazojamuva/alfresco_community_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/aathi_kathi_song_by_inno_genga.pdfIn PDF document text
    • http://bixobetagosap.epizy.com/dusorurepomediloj.pdfIn PDF document text
    • http://bimivopi.epizy.com/fokolorenopevate.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/jutosoturamadu.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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 5440 bytes
SHA-256: 56e0f9ecad5d44c54cf60fc73b4ee704b24de627cc5084e110471a46cefc499d
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10468 bytes
SHA-256: e0f9224f2ec5ea5007a770df9381eb1db6f1c7c685f0716d97d55bd8369df68e

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