Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aad8e7ab6128926…

MALICIOUS

PDF

98.2 KB Created: 2021-06-02 06:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8519d627c532359a15e8ce80bc9f79a4 SHA-1: 2cb9b7a307eedc8040184e9413214c3ad5918970 SHA-256: 2aad8e7ab61289261fcfdf11861ef310ef8178c9ce76dc2440696895d7a3370b
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 0.9991

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://queure.ru/pbw?utm_term=what+are+the+three+types+of+infinitives PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368219/normal_606b5e6d498e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488139/normal_6052bd7e21448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6016794c7b1d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_602acb0f7fe56.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/wigoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5fc65b074738f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe3ea01ae6bd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450428/normal_60aff70b3a06e.pdfIn PDF document text
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/jofopowutova_medamu_segomefinu_zozep.pdfIn PDF document text
    • https://melijavunibujov.weebly.com/uploads/1/3/0/8/130873932/7fe684b50.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/34c131f9-9a35-4a4c-bf91-1fbb9c4bde16/excellence_group_luxury_hotels__resorts_jamaica.pdfIn PDF document text
    • http://barumena.pbworks.com/f/43003309249.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144421191/rules_of_exponents_n.rn.1_worksheet_answers.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144465072/xopamilatewinox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af32e5c-f6ae-43c4-8126-8cb848afcf06/82067091424.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144490089/toastmaster_air_fryer_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da43afb-b3ab-4455-a2bf-2e786e89c175/how_to_write_slope_intercept.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a19e9e9-7c25-4e3e-b9ef-beaa35b23c82/gosizupitolizudoka.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144481062/virusuj.pdfIn PDF document text
    • http://kivupored.pbworks.com/f/tubidy_music_download_app_for_pc.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/w/file/fetch/144459855/8765657560.pdfIn PDF document text
    • http://garigor.pbworks.com/f/kejupegugilewotirew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd4086c-cf8b-4dfd-8e92-f2fbd422470b/larugifavabutativel.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_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 4920 bytes
SHA-256: 88fd6d08f1f3246fc6cf16b0048628324d68220d2ff5ff1295871b1828d4b4dc
font_01_sfnt_off00014548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14548 12224 bytes
SHA-256: a17ab4c2afcdaa849bc4e35b325a5ec9f86c420dcc25dfcfab2b929b88dfbfd1
font_02_sfnt_off00016d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34