Malicious PDF — malware analysis report

Static analysis result for SHA-256 72168a47038e5672…

MALICIOUS

PDF

60.9 KB Created: 2021-01-08 08:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40a43a8d84d22364c2a49bffeb818d5e SHA-1: 72437534254d4f5d3c0166ac4ff488e9f8a0615b SHA-256: 72168a47038e56722b2e93df94d37f76c8abfe428c9be99f79989d5f5f12ae83
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://trafffi.ru/aws?utm_term=marigolds+by+eugenia+collier+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/wuluzajiroz/ehcghie/ice_cream_2_horror_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f8c84aca7231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5f95d905b282b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5f97b2c863fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5f91c50f4fd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fc0b0077ebbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5fcf2ddf62681.pdfIn PDF document text
    • https://nubodizigo.weebly.com/uploads/1/3/5/3/135346475/eda03d27d594a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fd62b248b9cc.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/hbihPii/41583747400.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/c1be0870-d145-4656-967c-774c0cc53e53/nivuwogopenoxexuduvabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b52f04-4c07-481b-8236-8e6546242ac4/gosunavivarid.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_off0000b242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB242 5572 bytes
SHA-256: c7ef9bfa13607d08ea0deec1e07f93583bc05f08b82c854e4ec084c8e124bbb1
font_01_sfnt_off0000c55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 9724 bytes
SHA-256: 7ffa24db27b5557c4bfcf6f93be37043c481eaf36ae87c29eb179c75929e9378

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