Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f77ab1b20fea953…

MALICIOUS

PDF

68.7 KB Created: 2021-02-21 02:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9a25fa8b329d0fd4cc810a6122f9bf89 SHA-1: dad8cf238e57e03936edf625716dc74df7bdf065 SHA-256: 6f77ab1b20fea95315f33f4d7e870f90af0319d0833c0bdb17d5bf0d7e289542
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a link that redirects to a malicious URL, disguised as a download for an engineering handbook. The heuristic firings indicate it's a malicious redirector used for phishing, and the ML classifier strongly supports this. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=electrical+engineering+calculation+handbook+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_6005e412069da.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/hjjTdhe/slices_and_ices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_60242d2b13119.pdfIn PDF document text
    • http://clubstore.pro/sakanirexatijaveludzitbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5feb4b7ba7adc.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/i3BSiiK/love_ringtones_download_mp3_telugu_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5fd2cdcd83f94.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/eOXNshe/dupujota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_5fe91455cc976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_601f0437402d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_5fda041848fff.pdfIn PDF document text
    • http://electorat.org/exampro_cell_biology_trilogy_answerswkucz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_600a78e1a7a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5fe0c77e6a4c7.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/popilo/19480591604.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/official_backgammon_rules.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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 5400 bytes
SHA-256: 5d6ab88e3e0a6ed14ca93881cadf388d2a8fb86e23fbbc78134e407d182487f2
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10664 bytes
SHA-256: 8dc7f0b672c3eb434a3b23750df4f849d59f0e6027efd9babcc61e5b58bcae0e

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