Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3f6736f2796309…

MALICIOUS

PDF

58.0 KB Created: 2020-11-13 09:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e9fac9df974239ba77dfbc81234443f5 SHA-1: 920b43739b60dcc124e302e84598f2297e2a054a SHA-256: 4a3f6736f2796309698117a05cbc9dee89b462c2b071bc636c4400437cff38aa
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 0.9996

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://traffking.ru/strik?utm_term=ali+ercan+ilahileri+mp3+indir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8ec2c7e19f1.pdfIn PDF document text
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/gijosomeduxebonav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f8bf01569257.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/5728097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5f89f9e1632c1.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/634e797c-fc76-447a-b130-4af01b66cfbc/vovivunuwaruxevuzifewupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eac3e78-3ba8-4da1-8751-f4ecc953d455/54523957206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fa51c8-7456-4fc6-990f-61199871d503/mumokadanaxolugaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bd7c49-84f9-451b-9811-1d42dbc203da/pupapilabilegor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f3ae35-dfe8-4224-ad24-c459c80fd8ff/lewozanifiteniku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe2df58-2ad7-461a-8c25-e1798c70052f/renisa.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_off0000a6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E2 5288 bytes
SHA-256: 1ae755478478c5585248820a56d4080ad765530cb823eb323e5dca853c7578bf
font_01_sfnt_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 11032 bytes
SHA-256: e24d05d53b97a776f487d254da57ee8a322ffb2a946df848059e8911abe7ca45