Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00a77340384d2d8…

MALICIOUS

PDF

77.3 KB Created: 2021-01-10 08:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3c8337f5f0e51678d8560406e378a666 SHA-1: e9857952768a88198a35c669227ab1dd19b96b81 SHA-256: c00a77340384d2d83444b4bb8991f114e18d2f8126b3218ec468f75ba753b6b6
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious or untrusted websites. Heuristics indicate these links are used for redirecting to malicious infrastructure and are part of a SEO link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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
  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=mophie+juice+pack+helium+for+iphone+5 In PDF document text
    • https://cdn.sqhk.co/sixepatexup/hWgiiho/most_beautiful_wallpapers_for_desktop_free_download.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/xososil.pdfIn PDF document text
    • https://pamixame.weebly.com/uploads/1/3/4/5/134589616/2191946.pdfIn PDF document text
    • https://cdn.sqhk.co/zovigobut/XjbE6ZZ/76479188427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458852/normal_5ffa6b645a4a0.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/jfzigWo/vpn_private_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f8f2ed374b1f.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuravaxoxi/2OAPKZh/spooky_scary_anaconda_remix_lyrics.pdfIn PDF document text
    • https://site-1176622.mozfiles.com/files/1176622/tubumowefesujijor.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/napisakaluja/18940325815.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/sezebog.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/lanoges.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/25553684199.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_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 5344 bytes
SHA-256: 193e298796f0df07ec3d5e575213c79433e22ccc73e7864abe1e5efd34396212
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10776 bytes
SHA-256: 12f1af73b858b4e80e842214bff28cb7d286ccb9b5be71a372a4e937ad0ddcc0

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