Malicious PDF — malware analysis report

Static analysis result for SHA-256 993cbbb819bf7c32…

MALICIOUS

PDF

67.8 KB Created: 2020-11-17 05:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 335d051534a545541b4602bb70bf368a SHA-1: 3a974717f308af7e55a847dbb6be3d6f6699117a SHA-256: 993cbbb819bf7c32b4c8dedf83ac198f72de59b73a0614f5324ae17f81127877
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, with numerous external links, one of which is to 'trafffe.ru'. The document body, though heavily obfuscated, contains references to 'jquery animation tutorial' and 'wkhtmltopdf', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely related to phishing or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=jquery+animation+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f9c02394dd06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5f96401f4ad35.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/ce2757d613e479.pdfIn PDF document text
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/6156248.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/fejififimaketo/42738314711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0b1f34-3798-44d1-a99b-5d701a0a9a30/enseC3B1ame_a_hablar_gloria_lopez_garzon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a852e358-be83-4f7f-bdc9-8d3b4f3df556/rujexexukowebuzewamadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5c3b43-25f4-4723-9633-38cfea19658f/verb_to_be_negative_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ac1999-29bf-4d5d-a378-bf6ae8aaefa0/41996217178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2171fc5-24af-4234-8473-c4e48a7d4393/45982983087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d5872e-0703-4678-b723-16226623f06e/dujewuturasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762ca2df-9013-42f1-8b2a-0f852f88874f/koo_za_rot_zab.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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 4872 bytes
SHA-256: 1878ab80aa9f09d95c0a52aa39caa7fe54aa727b918aaa4f7765990029776b33
font_01_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 10928 bytes
SHA-256: 1128eb36d22c3f25773952581058cf1c6ad12eccfe049599ec57729e1229b71c

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