Malicious PDF — malware analysis report

Static analysis result for SHA-256 34940ed2a9ed01ae…

MALICIOUS

PDF

76.7 KB Created: 2020-11-16 13:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8278dbfc8750ef69a7ad0382cae53122 SHA-1: 910ec6b0a424a593a1da57abef53b1d416d3891e SHA-256: 34940ed2a9ed01ae19ad484d806fb3b04346546c3b59caf161e891034a2fd239
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'trafffe.ru', suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient for a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=avogadro%2527s+law+formula+explanation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5fb25a7a9a185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fad9e45ac915.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/a85dc9f85acab6e.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/f085f0a43baf63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f8cb3c585857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f8bd471f25c5.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/geradi/altivar_31_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/12045934333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfbb01c-8a83-4c69-96dc-eec385cfeffb/myers_social_psychology_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/19556173997.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/reported_speech_advanced_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b29ebb-c25d-458a-add3-3df3726137d8/takejug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7ea9f6-26d4-4209-8251-33efb41bfafb/26740556421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531b4a55-0d32-467e-919c-1e9897496c5f/guniluxijisetud.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 5604 bytes
SHA-256: fe8f47033d94d647f6c15a09cc2e02bdb99bfa9c7206d78b046708378fcb7459
font_01_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 10904 bytes
SHA-256: f2bd77b138f1a6b0eac434ed448f0fa451023bac876ea3a90f739cf34a3f6c95
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 16192 bytes
SHA-256: 74a35dcac671789a1952909c7064e8f0092ccf84988030a41650584fa1b75142

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