Malicious PDF — malware analysis report

Static analysis result for SHA-256 708a4fd230a70074…

MALICIOUS

PDF

77.1 KB Created: 2021-05-25 07:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5472e8e7160bfec81032c2068ea1b164 SHA-1: 7259d6bf2d50c32a9d26af40fbbe730099edb0e9 SHA-256: 708a4fd230a7007494aacb640f1b88d87004ce02d979080cadac0115f5e80a7f
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure and hosts a link farm. The primary URL, 'https://mezovuduw.ru/strik?utm_term=how+to+play+gta+rp+on+xbox', is identified as a redirector for free-download phishing. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', strongly suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=how+to+play+gta+rp+on+xbox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6048a9e38bd0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_6020a2c57bc4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fe4b9c8adfb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_605654d70e9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6041956abb9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_603035f010927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_5fe850f293dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_606c6926c48ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_6027369897502.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/wajinadosipit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_601048d24d6e5.pdfIn PDF document text
    • https://ruxibini.weebly.com/uploads/1/3/2/6/132680870/verosaveb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fdd8984ddec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478415/normal_60068f255ac8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_6056f29ccdd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_603e6bb4c60c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4ef727-0cad-45f2-bcd3-a6a79ea9f36e/phones_for_sale_meridian_ms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ada19f3-0637-4007-8e6d-e8fd4e4340b3/2388365109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4eaf26a-fc3b-4e5d-a486-eb159bfbb4f4/92284829230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bede4151-6a5f-4249-b672-7d7b157e218b/bejazafarutisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336a394d-9cc1-4444-b25f-50a77c56b9e4/linq_to_sql_tutorial_w3schools.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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 5172 bytes
SHA-256: 2207ffa7acfd3e4438a345e685431caa2b40789c80bd52be1f70dd57f4d574e2
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 11920 bytes
SHA-256: 009b364015c4d2cbc868fc48a25f708e257be9cd22d2640baa4c8dc1eac86390