Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fc73d8f2db30a0…

MALICIOUS

PDF

74.2 KB Created: 2021-06-10 03:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 09affb6d7bb64d290fa4233e96ef8f3c SHA-1: 4c9c36daa4ceee2036960d6bf291450655f64f77 SHA-256: d3fc73d8f2db30a0128b5ee0ba83d5373eac1028b1746ff5f21f15c5ed667f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to direct users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/pbw?utm_term=pg+8x+vst+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453732/normal_60025c0ef32bf.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/66aab2bb0.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/puvurolerofim-piraturuge-xilex.pdfIn PDF document text
    • https://wawomageton.weebly.com/uploads/1/3/4/5/134584849/rakozezesujido-xewoxipupojek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_6060016252b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_60623fa2b5266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_602c5106543cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fd64cd2a6dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_6064e14a8272f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5ff4a9ab7c4c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/976f4906-6ffc-4296-b5d8-2e10fc648497/el_hobbit_libro_espa_ol_ilustrado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876a925f-eeea-4734-b02f-daacd90a1b7e/83383421362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64f75fc-12fc-49c2-9f65-bfd185bb2adb/nibewevikasafavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159873e4-44e5-488b-8ca7-3637fbec30c6/engineering_drawing_sizes_j.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce46a1ca-84ab-449a-b9fd-b9388d63b712/bo4_blood_of_the_dead_spoon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a9e508-5234-4cfe-9aab-fa87be6cd58a/math_olympiad_practice_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734fbd84-0abf-426d-b864-3e4f63808254/mimoxikadela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cde993-5949-4f89-8b4f-56f7af5d42e9/78185684528.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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 5016 bytes
SHA-256: fe083506c6ba80965ec89c59a0837bde809e32766dc090be0cd02a94d04f7cca
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 12252 bytes
SHA-256: 2657bb2e86116790c5856f65c47f6f59a0f37514ae5034eee5798f7848c4ddb5

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