Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b859cb5f9ffd8a4…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 14:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce1791a0c40bd713f02bde01181e5b85 SHA-1: b84270f6785fd2266794ef512d1c48e2be7a5842 SHA-256: 0b859cb5f9ffd8a44db20afe92fa746c9879b81b316e96484ba6e6992629ad56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to suspicious domains, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=lg+g2+price+in+uae
    • http://lotto-investclub.com/13249880260h2z0o.pdf
    • http://xenejesujotolud.mypressonline.com/91739722598.pdf
    • http://tumuduwaju.mypressonline.com/kikuwon.pdf
    • http://wunuvuzixuxi.getenjoyment.net/vudagudokatovabadotosupon.pdf
    • http://gudokav.sportsontheweb.net/90710916372.pdf
    • https://texerazijibegu.weebly.com/uploads/1/3/5/3/135302316/4490076.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/xulenijezag_pedigitiliv.pdf
    • http://clipshd.design/62422122497t7k4l.pdf
    • http://fupemagis.mywebcommunity.org/78941685291.pdf
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/120c87f7ca78e.pdf
    • http://bapatavusirave.mygamesonline.org/jixuro.pdf
    • https://gexuguxibam.weebly.com/uploads/1/3/2/6/132696321/bf5793993.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_947972def3604496a4f3ba6381ae00d1.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_f03070f4a6824fbf994ca344ced155eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92c139c9-d2ed-41d1-bb0e-d00689e67132/bipudazaf.pdf
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_fff7bf205d5e4a95a555ee99c5de8a9b.pdf?index=true
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_b54e51e364bd4a89b8ff030f5c0c5af6.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_17cad2c5e72b4fc9a26eeba5b4a57419.pdf?index=true
    • http://ginowane.onlinewebshop.net/frigidaire_refrigerator_parts_fghc2331pfaa.pdf
    • https://uploads.strikinglycdn.com/files/a5e647d2-d076-4017-af6a-a95979119d11/study_bible_for_pc_free_download.pdf
    • https://dbzstatic-a.akamaihd.net/dist_252d9eb47a/videos/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7da.bin
d1a5d5d24aea192088ae397fc36a4d1e13eeacb92cc02a6fd48e9223dd33c430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 4964 bytes
font_01_sfnt_off000108dc.bin
003c76a664aefcd8995165279104b12b3fcbc085dd5ecf486f70e65727e84318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 12312 bytes

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