Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43ced685be3267e…

MALICIOUS

PDF

72.2 KB Created: 2021-02-23 07:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf22ef00985b3ca2c00e69c5cd0822d2 SHA-1: 085106d74eecc97fa7090cf98f2b15873b75e16c SHA-256: b43ced685be3267e6163f978c784890453388cd82a44d83d59ef7fba5ec7e089
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-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://crophysi.ru/wix?keyword=broan+678+manual PDF link annotation
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/9440462.pdfIn PDF document text
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/lizugumotabob.pdfIn PDF document text
    • http://mifvideo.space/sigmund_freud_psychoanalyse_zusammenfassungs6dup.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/2298867.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/lusope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3da1cd389d.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/3512105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_6023010cf069b.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/jhjamQ2/how_to_create_a_youtube_channel_malayalam_2020.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/relevance_of_axiology_to_educationjicd2.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/ruter.pdfIn PDF document text
    • https://mejoraxu.weebly.com/uploads/1/3/1/3/131380998/2876549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d2b99104e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_6009587015c4f.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/pujirageg/gujajuvuve.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/foundations_of_logic_programming.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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 5128 bytes
SHA-256: 7aaefa873e81be3a508bec80feab841cc3732bde5643565d7d61aa25e8bd1ed9
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 10380 bytes
SHA-256: fcacc100020c40869c919fa00bac1737ce7d739dbb81f51833ee96a7e3333fba

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