Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ff3e30bbdfe703…

MALICIOUS

PDF

79.8 KB Created: 2021-05-29 05:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ee004de693144260061eb53314c2f6b SHA-1: 9b61cd58ecdd359d877e861d334b2c1d1a1eb15f SHA-256: 89ff3e30bbdfe703d59177ad4cb225a70a9d0366b925654a67fd7c22efa558db
186 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 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 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.
  • 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://gimoguvi.ru/123?utm_term=truck+simulator+usa+apk+free PDF link annotation
    • https://dunopugagikevu.weebly.com/uploads/1/3/4/7/134728147/1696721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_603e8911c2350.pdfIn PDF document text
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/puriziju.pdfIn PDF document text
    • https://xukunuwemixul.weebly.com/uploads/1/3/1/3/131384589/991b7e6539d.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/wajonegurap-ripij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_6002a11a1b2bf.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/tovagivuwezogetazu.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/17704338-d030-4342-b92e-6f8c37def325/beauty_is_in_the_eye_of_the_beholder_dd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a210bfb-d142-48fa-ae14-83f73de49116/serato_dj_software_free_download_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed08d93-05b7-460f-b260-93c32c2e947e/faxijik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2b44df-7d46-44a8-b8f8-d1285809bd8c/lesinibazanujosebinimuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ff5a74-b280-44b3-bede-ee10933aa86a/lenovo_g50-80_bluetooth_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5634d47-e4e4-4994-9c8c-2ede7ddec011/9545530168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2ac336-5688-4cfd-8327-30e566a4873f/57514308195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb7ff99-8afc-4586-9fe5-c5ba2dfacb92/can_you_add_apps_to_a_sharp_aquos_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f637c67c-4677-4142-8a3e-18f8f733b683/95663198619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82dda327-da81-4f53-ab94-e259a620b711/algorithmic_trading_course_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5a712a-cc0f-4d62-ae05-d49061924bef/5_ejemplos_de_la_ley_de_ohm_en_la_vida_cotidiana.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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 4948 bytes
SHA-256: c4c3925272ba617ac4d0668dc9d0c5faf63804722d6b028c2af76cf0ea4c8bf3
font_01_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 21548 bytes
SHA-256: 11a48fb73e838ae5bf47d05af829ee8ae023c72139aeb6193957af3d157ae2ca
font_02_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361