Malicious PDF — malware analysis report

Static analysis result for SHA-256 85443aabac6347cc…

MALICIOUS

PDF

74.5 KB Created: 2021-03-18 20:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f7365a3e5d5e19a1ea61f0e84b67090 SHA-1: 537a0301bfc22a699e831c1c5183564af8c77740 SHA-256: 85443aabac6347ccefbc985fb9037fd04fc0e38e918eb51b97eb8597878f4f3a
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 0.9996

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://dafemum.ru/wix?keyword=ambient+weather+station+ws-0101+manual PDF link annotation
    • https://cdn.sqhk.co/tisomala/hcmjjhb/1478070095.pdfIn PDF document text
    • http://copyright-securityx.com/63257879929jgupm.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/kral_kaybederse_kenannzaa7.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/dumufexivotem-devigi-fukive.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/e3ef4c6da8b6156.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/gcxPWid/wewebazexonewejixaxu.pdfIn PDF document text
    • http://fullpisetc.ru/benumulelojokuzisz9sc.pdfIn PDF document text
    • https://femerofuvarilef.weebly.com/uploads/1/3/4/0/134012326/5016384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fcaa08b37f98.pdfIn PDF document text
    • http://matrixbicycles.com/westbury_high_school_dress_codezwspx.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ifhhcji/63530828063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5fe84a5cb0327.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/iia4jgA/marshmello_wallpaper_hd.pdfIn PDF document text
    • http://crysety.xyz/918633723389bi0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_602ec94a305cb.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/aead9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_53d7186ece0f4999943973a951d55586.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_99104ece9809461c96c0c4ca23327d59.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_7b94ea348c28417da38d737e277c83ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/78228619921.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bezokagipuzuperoliba.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_bfd0d31fb1d64bac9710e9ae987d3806.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_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 5372 bytes
SHA-256: 4b42453e99706e5340d674c8ad286c2cceda637dbf4eb3c935fa1afacd307ee0
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10828 bytes
SHA-256: 77cb857923eb9db87c88b66aea6e52ab9d2102c15c236b7986b3497124fcf978

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