Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69c9df0ec004da4…

MALICIOUS

PDF

79.7 KB Created: 2021-05-03 08:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 44eabd38e462ff569dac7a1b3e3ad039 SHA-1: 2560f49bdecb93d577f88da74421ae91173d552c SHA-256: b69c9df0ec004da42a63fe3b04b1849a2ce382c6ff149384a3a0d378d1ea87e1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary technique being the distribution of links to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to lure users to malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+do+you+share+a+link+on+facebook+stories PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ff585a84d884.pdfIn PDF document text
    • https://dewazolasimuf.weebly.com/uploads/1/3/1/4/131453174/9789681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6023df083ad8f.pdfIn PDF document text
    • http://nudazemuxebabu.22web.org/bekamiridimebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5ffa531c486a5.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/moxozosi_vizup_mevejonepeve_mizevif.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/5811261.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/cb95d2c47b618f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zinudipir/75303099942.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/government_spending_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/tezidowifolegumomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999d5ea7-4734-4320-92bf-ac7d7e24398e/68134099323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1b55aa-6a75-45ab-ac1a-1ae69d82ccd4/tevusulosewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d4a0c2-6137-494a-8e20-0b239f031bd6/pamevozuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6805ff-5612-49d0-a531-43d4e15b0399/rifalowinijemipizawas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f5e9f7-5e85-44b7-a4fb-b56291c85b73/how_to_connect_bluetooth_to_pioneer_deh-x6600bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e567cb32-11bd-47b4-993a-e7a1058c70f6/2502054247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f1e7b6-8b53-4e0e-8d9b-439627f293ca/wajamivusadudojowubom.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/3006315144.pdfIn PDF document text
    • http://butadiviwev.rf.gd/21328264952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80e37de-8169-41d1-b8ac-623a9bbca5eb/can_division_ii_colleges_offer_athletic_scholarships.pdfIn PDF document text
    • http://fedetikapore.epizy.com/cognos_active_reports_tutorial.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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 5468 bytes
SHA-256: e9b811bd33e9e7e4189c94055713b10392d5c0c67494ed914b542719704df987
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10904 bytes
SHA-256: f4208c3d4c7d47f210978c11469d8d22d805ab3cacef8a1afbefbf60d963e4c2