Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1f035182a8e8db…

MALICIOUS

PDF

77.8 KB Created: 2021-03-10 07:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c29b79e450d8155bd7f8a059f813586d SHA-1: d947cdf6445433761a539b213fbe02df78b86d5c SHA-256: ca1f035182a8e8db97c4a720a7fc075bbc9c18a5c6cfc106a7f7e6aaab5cd8d2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document body, though partially corrupted, suggests a lure related to an 'M-audio keystation 88 ii manual'. A high-priority heuristic identified an image lure linking to an SEO redirector, specifically 'https://jacksth.ru/strik?utm_term=m-audio+keystation+88+ii+manual', which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=m-audio+keystation+88+ii+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410986/normal_604833177092f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5ffb60b5b3c07.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/Omusgfm/lamomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6036da3b59e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_603111a69c44a.pdfIn PDF document text
    • http://naropiwazufilu.22web.org/58949942942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_6034c0683183f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476421/normal_600881b47a817.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/kSm3Tia/telugu_movie_love_ringtones_download_naa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_6015a9e43a4d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_6008829fb023a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_602016b31f733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450247/normal_5fe1009d7709d.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/eGgepid/telegram_messenger_by_telegram_fz-_llc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raregorale.epizy.com/the_real_jazz_solos_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/42086996028.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/maternity_leave_allocation_form_sss.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/adobe_illustrator_cs6_for_windows.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_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 5272 bytes
SHA-256: c550e714c7e215508901f6a32cc09f7be7a8961921c146b859802902c7e01f26
font_01_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 10700 bytes
SHA-256: 1d46e8809e8b4e2c23f083085c52a61d5a2a9be7c7d503919247a0005f603f65

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