Malicious PDF — malware analysis report

Static analysis result for SHA-256 c091bcaaf823110b…

MALICIOUS

PDF

80.7 KB Created: 2021-06-05 00:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8d92d6a639f4b3ea4fe1c67984d0012 SHA-1: e90273b037a67116daac15e37002c91f70e8d65d SHA-256: c091bcaaf823110ba786f0949137aff4b648978116ebbdbd1819cd7f212d629b
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 0.9996

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://dugedepap.ru/123?utm_term=medical+embryology+book+pdf PDF link annotation
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/c3e1b4791afa53d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_6005bc6b7bd0e.pdfIn PDF document text
    • https://wuvatefowid.weebly.com/uploads/1/3/4/4/134470889/9695301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5ffbb396c0e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_603aa92328603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_60ba946a7ae36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_60250c0e7c274.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/judizebatateta.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/4a84e02a036d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_603b50c2417fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_602a8ffb3c2b7.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/080533ad58f69aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_6059d67063ecc.pdfIn PDF document text
    • https://batoxomaziforu.weebly.com/uploads/1/3/4/7/134708014/setaxikikibigi_fufugosizemefi_bazizago_pepexe.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/fa729f05-5b15-4027-8d5a-ccc64b80cdb9/my_dyson_fan_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e16c55-df88-4cba-9fa0-b82ffd9dce7c/musapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e476fba5-61c4-4d04-90f1-6a5b86209578/lizekamaridu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae64a4f-2e42-44ca-9ede-ff4c8088e78a/35285562452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7979f230-f5f5-43a6-8727-afd7ce340d69/36492780161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229899a9-77b3-49ee-8f7d-e68677479f57/54026898018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254d1ba6-4a06-4377-8e39-50aef24db87f/el_destino_de_10_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c15241-a7cd-4df2-b637-db8a9773238e/night_shift_cast_season_1.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_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 5608 bytes
SHA-256: 466d6feb03358f689f931f5979fe733260401b80ae6f9a58402df56f25b5c9c6
font_01_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 11112 bytes
SHA-256: 3cb21a79f1b655b8aac372d3448b293620f53f3befa97f00e3ae496f5a46843c