Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec62ac3dbcc7c4e…

MALICIOUS

PDF

70.4 KB Created: 2020-12-13 20:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 26d0e55534b774eadd0f04b50365a153 SHA-1: d97d0dd0b30785f8db8a39478c49180434521b51 SHA-256: fec62ac3dbcc7c4e51dadcbc032a04c67f7c3f9b787c2709f72996dddb3cd613
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 0.9997

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://traffnew.ru/strik?utm_term=skyrim+se+wedding+dress+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422645/normal_5f9eb863ad175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_5fa7eae941c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f874fe2df846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5fa21ed65b662.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/631429470948e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fc5ab6b194fd.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/bidivo/92901319696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82ac24e-1673-4129-8906-29a34b74addf/cabasa_instrument_facts.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce359fc9d5960055fc8220/t/5fd60683df2f0204c22c3072/1607861892081/first_grade_math_worksheets_halloween.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/mac_catalina_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e24dfb-43f8-4aee-95de-566fd629f801/jiwutofifazib.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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 5264 bytes
SHA-256: 3a53215f2520793bec82cca0816076055213033f94799b748b1a38aedb21b43c
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 10672 bytes
SHA-256: 5e35f63ff0aa070e58746293af1af71cfde5c1a9c1cc50cb10055ca9e2f23d87