Malicious PDF — malware analysis report

Static analysis result for SHA-256 98edccb7275d3913…

MALICIOUS

PDF

62.4 KB Created: 2020-12-05 19:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 65d3f7624d9a85d55ddb290de63a6ed0 SHA-1: 53d1602e42e535ff97541d3863aa2375de45dee6 SHA-256: 98edccb7275d391393d1ccfdc8d683fc13289b34819e7dc42ed3e379e3fffd22
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 0.9996

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://trafficel.ru/aws?utm_term=asturias+guitar+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468551/normal_5fa5bb0fdb286.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/biwebuto_rowugisatepif_jozajokazor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f9a784b2fc42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_5fbe0352b3cc0.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/bagisi/wifi_cracker_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33652cf-f9c8-4deb-8af6-8995c2f0112d/integrated_chinese_workbook_answer_key_level_1_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629581bf-e881-4811-aa15-fcaf065f6e67/pemitujadujiderumogemuxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64a409c-3cbf-476f-aedc-5b16ecd0b567/xeguboxosi.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/33320441148.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc342e327a199023ac4b189/t/5fc70df856cd4459b3af57dd/1606880760931/doruroniwasuvixujanelu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf64643485235c86be4def/1606378596723/best_manual_can_opener_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136d597a-09ae-4b9c-9f25-0a38d411c77a/ripudawug.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_off0000b789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB789 4904 bytes
SHA-256: 6917304ad90e9c80b05ec035247ad230e327bc6f64d93d26877fad5ba013e092
font_01_sfnt_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 10948 bytes
SHA-256: f2ca6c41d88da8e83fc312516b3d754160c61534dd8c0a3c465264e1689f049d

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