Malicious PDF — malware analysis report

Static analysis result for SHA-256 710fb57efb7aa6ff…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 11:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba631d1680ec4caa35fdb2653d13fbd4 SHA-1: 533187d57ae5974fcf2d933686ca7f324efcdb34 SHA-256: 710fb57efb7aa6ffba8bd1a85f38b293734a93e27886047d22e14114e5ec4466
134 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 an urgency-based 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 0.9998

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gimoguvi.ru/123?utm_term=fm+whatsapp++latest+version+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fd1dfe85ac0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5ff9ac0f63de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_604808cc6f5f0.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/fHhgrgc/diy_face_mask_easy_to_make.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/h3Kdgj1/onedrive_don_t_download_all_files.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/0a947129-e741-43fc-8171-aada24c9bdd5/how_to_write_a_comparison_essay.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_fc16641099c64bf2a33ba77fc1205a68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/024931b7-f530-4e61-843e-6bc81268a1f9/mustang_960_skid_steer_repair_manual.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_ac9c2ffcc02e486ab8f94c5791e9bf1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/52616930195.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/gewuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb30df4-b56c-4e69-ae0b-7197c138edf9/41739081989.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_978f6010da9f4dd591bfde54d6fcecc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6667b950-69d2-4c1d-8b21-6137b9d80826/napedubozawobelewavopug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcafa41f-35d3-40f7-ac63-02cb11210313/292758519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc609e3-dd5b-4ae0-8325-08ec788d9944/najedabog.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_84d4da9b4f1945faa53101339917e50d.pdf?index=trueIn 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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 5648 bytes
SHA-256: 5e434ffa5a6f1d13b243aaff07221e43faaa474f91185969c54453cdde9d1772
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 10392 bytes
SHA-256: 81610acbf2f703793a5d5130ddd24eb1420ae862a228f740c00c0a93410f8296

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