Malicious PDF — malware analysis report

Static analysis result for SHA-256 5278211d059f3f05…

MALICIOUS

PDF

72.5 KB Created: 2021-01-13 08:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bd96192d85edaf2103022ac5457ae259 SHA-1: 914d0999c40d743568760e72c791c89b4a62c336 SHA-256: 5278211d059f3f059b8389c28a98e6d4c2a3964634c5168048c6f340e66b61d9
164 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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=skyrim+requiem+mod+guide PDF link annotation
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/tetegubimujojexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5fdeb0c38871e.pdfIn PDF document text
    • https://site-1168535.mozfiles.com/files/1168535/71697602897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fbf699c8d64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5fd9bc8d3f105.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/wogiselu-taxisejedofim-tokeremakot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f89e306b5407.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/97701179819.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/dujepav/the_alchemist_code_mod_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/88169851487.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/32467435585.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/zenudeterupakug.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/16100818223.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/canadian_clozapine_monitoring_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/chinese_action_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/joomla_framework_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 5120 bytes
SHA-256: 65c064d581e1e015acd463e13723473d9159e67be97fd8422b9f6a2ea806721d
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 11144 bytes
SHA-256: 0822065fb31f2bd58ec9d2adb915dd6cbfd80d5db309a91f88f22f1cd4d00037

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