Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1c295a5df55b08…

MALICIOUS

PDF

79.1 KB Created: 2021-06-06 06:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 685e18424e969fc128b7a5f9d85d7b3e SHA-1: 05cfe2fbc0747d7760a4440b39fca99e78e817e3 SHA-256: fb1c295a5df55b08843c69c1385cac1626f5907b28630a1e99ab8d58f874e20f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=adverbs+of+manner+worksheets+grade+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478393/normal_60276b310b3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_6029437f7ab1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_5fed5603c99d9.pdfIn PDF document text
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/959c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_606e3ff802717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_604e791a755d0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387921/normal_60b72a0f22fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_604df042702d2.pdfIn PDF document text
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/ee57dd3f335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ff957af53b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_60b88bb109b67.pdfIn PDF document text
    • https://pubigomusukuma.weebly.com/uploads/1/3/4/5/134511275/xupepan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ff81a93962cd.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/757f62d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_60341a80da0bb.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/rakozexu-fukadijizuwiti-tamef.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/5a33694e-a9e5-4ca9-9a76-51e54727ba77/mibipevekoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c63e09-6ab0-42f2-9b18-ebefd4b00a3b/how_to_pair_plantronics_plt_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4fb805-d6da-4b6d-9543-501a9fc676f9/rizagaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c371c3-5552-4688-aa8b-bb1421758cb4/sanyo_dp26640_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a8606d-5593-460f-ac43-f9d5e00f3524/essentials_of_statistics_for_business_and_economics_9th_edition_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6124c1-204b-4696-ad9f-c08efa0df99c/how_to_spell_french_numbers_1-100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6bd641-fca2-42bc-9419-c6b6162bf438/94184259928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26b9124-3cf7-4537-87a9-f43e90c90333/will_there_be_a_2021_mustang_gt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc39d848-85c9-489a-8153-5c39e71c97e1/hsbc_bill_of_exchange_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c618842-1043-4501-b74f-a44377fcfcbc/seiko_chronograph_100m_gold_watch.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_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 5788 bytes
SHA-256: 0dfded6e0fff32fdc23dd3072412530c303b684a452afe66797356f8adf3913a
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10468 bytes
SHA-256: 8a1d3d1227a02c0f0ec5458fd2c549619874e2de30513de9ad8da8f8759a586a