Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e655bee8d365f91…

MALICIOUS

PDF

73.1 KB Created: 2020-12-05 15:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c6f974d3d5848e9b218159de00db259e SHA-1: d2767a2439fbfeed9f02855fa0aafcfafe8adf3f SHA-256: 1e655bee8d365f918fe9bfa37bc9d55cc731a1f9afd82aec93d6064b4d689c04
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a password-protected-archive lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=selling+runescape+account PDF link annotation
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/ziporawen.pdfIn PDF document text
    • https://tozupetap.weebly.com/uploads/1/3/1/3/131383790/desolaredati-vivopeva-koseleja-todowadag.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/lubijetodowusagorobe.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/7338b05bf8b834b.pdfIn PDF document text
    • https://xapinetevum.weebly.com/uploads/1/3/4/3/134330578/a379cf5a.pdfIn PDF document text
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/d02d5db9cb3b057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5ad3434f-d75b-44ab-861b-9ece4197f438/geometry_chapter_5_test_multiple_choice.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/36099267808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f3ffb2-2d0a-4085-9de3-09b33e3427d5/67703330588.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc342e327a199023ac4b189/t/5fc669c7a97599144ed51071/1606838727438/mulowebinosizisomevatef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4fbde18c5c478ef26058/1606373311295/33863507285.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/76941708909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb5e063-f5b5-4e31-83f5-9331e637b1e8/ladbs_clearance_summary_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 5088 bytes
SHA-256: 0a9ed9dfb13d0dd86cd649e1a9b478c136c764d0386a23d9ee38d636b11eacac
font_01_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10872 bytes
SHA-256: 3052201b3b02ad184189b0543a8d9fec654ce1221424235056e8673dcfb747e0
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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