Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1250274e1356b5…

MALICIOUS

PDF

76.4 KB Created: 2020-11-17 14:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0f5766e20d534b8608b389724b17b01e SHA-1: 91fc27947fe939977a3c3b585dbed719389260af SHA-256: 4c1250274e1356b5dfddd8b9198ddcc35d982948ec4be293760a7618be913bf3
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 0.9990

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://traffnew.ru/aws?utm_term=apus+browser+pro+apk+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87407c33db2.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/041e6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f9dc8067f276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5fad8e99acfe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8a5b36ee2da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5fabad183aa26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5fa915b3835b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8b8ef793c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fa9cc6e3da58.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/zuxadol/metafisica_de_aristoteles_garcia_yebra.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 5148 bytes
SHA-256: 64ecb09a8d86725ce5d6670304200eea543b2f24449a9262b442665e1d523d88
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 4664 bytes
SHA-256: 049ee640a1375cc91614ea096305a3a14e6cddc477700af3a02760757104c25d
font_02_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 11164 bytes
SHA-256: f7a39627103150385db67d56485f8d7347ea7585c23a124cfbbdc773b83bbb70
font_03_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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