Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83a6efa32cae7c3…

MALICIOUS

PDF

68.2 KB Created: 2020-11-20 03:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bace9080b8cf264310d4e66d5ddb59b8 SHA-1: d7da33458136762eab5efbe674c658b4794a5f62 SHA-256: a83a6efa32cae7c306242bf4663383678dd24773d9657fd09947eec3f207bb9e
156 Risk Score

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 0.9998

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/aws?utm_term=amniotic+fluid+deformity PDF link annotation
    • https://gokododilu.weebly.com/uploads/1/3/4/5/134578034/2ae4bdb3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5fb2921f43c86.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/7091682.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/9e7d2dd87f0.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/d665f119-b2c1-4983-a39a-e5514427f705/manual_de_urgencias_en_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/mogasaraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cd8f7d-f203-46f5-9f6a-b862f4d11ec3/57130905845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163e2af7-c9eb-414a-80f9-71f4b870d11a/69062925424.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/94069004396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0318d32-1324-4221-a0b2-cec22cb9cd8f/lojabusopumejiwemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5038bcc7-5520-4310-9c7a-e38c5d76bb5f/kalot.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_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 4868 bytes
SHA-256: d68f4ef41e7b48e6b401a17c6f9a089a348bbce35b16449394118bde88afd74a
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 11044 bytes
SHA-256: d6bb92962cf0a6950d56f14078ecb49886b9b11091180a44b6c9e4dbc8379e93