Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c998d9449b65ba…

MALICIOUS

PDF

66.2 KB Created: 2020-11-14 17:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c2282d49007b410b976b6dd374cb798 SHA-1: 1cb0f71a0975cd93bf88038805f68d56d0f16b6b SHA-256: f7c998d9449b65ba6bdffdf7e9da241cd7858ac44445d4327990dd48ed789c6f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that masquerades as a download for 'itube apk ios download', a common lure for phishing or malware distribution. The PDF also contains a large number of external links, indicative of a link farm, and is flagged by multiple heuristics including ClamAV and an ML classifier as malicious. The presence of embedded JavaScript further supports its malicious intent, likely to facilitate the redirection or download of a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/123?utm_term=itube+apk+ios+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fa46fd1b6b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_5f99aa4a60011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5fa6f01fadc4e.pdfIn PDF document text
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/49cadb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f9e2224dc227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f8bcfe81881a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5f922d9c4f1d2.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/21f8e1fc-3619-499a-b1af-662f829937d0/rivakinam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c211db1e-c813-4e26-a553-ac9f7aa18014/pokemon_advanced_battle_theme_song_i.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/peninebanunisoromu.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/celebrity_kid_named_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc3ab86-03dc-4a6a-9eea-ab0f64784fdd/dragons_dogma_badge_of_vows_25.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_off0000c6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C8 5092 bytes
SHA-256: 07aac81472baa44c54f277a564f5c51d29b2f039aac7f61773476a80b6def853
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 10612 bytes
SHA-256: 0c7b33ae668a0f60bd220cb88c46f4d80d04eb57f13a3608fcac8805c095135e

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