Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b2b90d1f4dc859…

MALICIOUS

PDF

103.5 KB Created: 2021-03-11 23:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce1de61fbfbe86a26f159a5aaa9ca556 SHA-1: b01effa33fd72528b8941716531816af5633d89f SHA-256: 19b2b90d1f4dc859d1b9cf0f6f9d67d30d48ff73bfb16956f6295eecc1b95d20
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or SEO manipulation tactic. One prominent URL, 'https://lozipotod.ru/123?utm_term=princely+advice+for+a+happy+life+pdf', is identified as an SEO redirector. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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.
  • 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://lozipotod.ru/123?utm_term=princely+advice+for+a+happy+life+pdf PDF link annotation
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/wetazugegeja_gunilomudinivas_zejade_fifowo.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/jiEgdhb/13971225994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_601f2a3cf08f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_60407bb0db21b.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/dimorafurek.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/vogedijudepo_doxaguzepawiz.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/voxujumogogab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_6019c6ea5e72f.pdfIn PDF document text
    • https://vivutavolid.weebly.com/uploads/1/3/4/3/134308799/15310ac691d376.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/gjdijig/jobezujive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_600bb6dc096bd.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/2a9e4d30212255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5ff58247ec071.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/jiwisi/2444197574.pdfIn PDF document text
    • http://pomewiwap.rf.gd/xilagonomanibofe.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/61860869621.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/calculus_2_series.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/cd4013_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/12102249990.pdfIn PDF document text
    • http://mavafakubew.epizy.com/delta_crib_4_in_1.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_off000158f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F6 5228 bytes
SHA-256: e51aa13997d4035607bd8f2efce28fbd9454da8cd78aa6e7b85def39a17e5462
font_01_sfnt_off00016ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACE 11236 bytes
SHA-256: 581cd4721dba6956c489a5b8cf6f3e422ca8bbf2a9b25975f040bc907cab4854

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