Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33a4c7db00f7afc…

MALICIOUS

PDF

77.0 KB Created: 2020-11-11 01:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d1be7a88eacebeaae6bfd85ecddd0a07 SHA-1: eb89f45322b184e5a320f731576aa69179df44b0 SHA-256: c33a4c7db00f7afce11713a75e6cd00c56d2506eed1ccc0c9377d03777eaa786
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including brand-impersonation credential phishing and a link farm. The presence of external URIs and the ML classifier's high confidence score indicate a phishing attempt. The document body, though heavily obfuscated, contains references to 'Gooloo jump starter 800a' and 'wkhtmltopdf', suggesting a lure related to a product or tool, potentially to mask the phishing intent. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/9249747.pdf.
  • 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://traffking.ru/123?keyword=gooloo+jump+starter+800a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f871da700777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f935d6b4d946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f88d2261b643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f9cdca144f19.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/9249747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5fa1468181264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5faa4566a4a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5f9b71513db8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6d2d00d2-7a49-4a76-b77d-a0f047c21b9b/vonox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745cdbc9-b5d0-4119-b333-73aacce37072/easy_piano_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224cee31-b8a2-4c74-815c-a42a93532659/31944096930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186801ee-c9df-425b-9b28-c2963d353ef4/xexarenuvi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 5136 bytes
SHA-256: e39b5eadb7cca45bd5798d99934af84ad8d637eeeaf0c28c8abc7e0bd899567e
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10940 bytes
SHA-256: 039c3d8ac6f521fbafe89eb83e4d24f653829130b9b149aba5688300b0253266
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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