Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b61b4db974bca1…

MALICIOUS

PDF

70.4 KB Created: 2021-02-15 19:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 95e1213acff2b7a2c842d6104449b7d9 SHA-1: 072e4154941cb171feb14c9f8330331dadace928 SHA-256: 21b61b4db974bca14a9de482faeaaf00924bf45c31d442d1a50477533e0253fe
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or redirector attempt. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary URL, https://yafferge.ru/wb?keyword=what%20is%20the%20best%20carpet%20cleaner%20for%20tough%20stains, is flagged as a known malicious redirector.

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
  • 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 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.
  • 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/wb?keyword=what%20is%20the%20best%20carpet%20cleaner%20for%20tough%20stains In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_600f8c237b4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_5fd8a2a6d035a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365657/normal_5ffb51e672ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_600e085758e1e.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/4487456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5ffd8633b401d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_601256828781c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_601076653471c.pdfIn PDF document text
    • http://womenit.space/chandra_chakori_movie_song_kannadapmce5.pdfIn PDF document text
    • http://popularchoice.space/227291029158jv5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fc7cd13b05e9.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/4ab5c0.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/fididofer.pdfIn PDF document text
    • http://trend-sales.fun/130222257710be8d.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/bogeguva/hanna_arendt_la_condicion_humana.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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 5432 bytes
SHA-256: 5d33ca3ff2142d612d620cbcaed8d202698e5502fa0afdb62b026482dc8bd9b7
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 10876 bytes
SHA-256: 1f027007a238b9cb22dfd980f1c899bc3a482c9465ebccc96aa8af28023b94ec

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