Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb610a1d889df34f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 18:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 899270634f21eb149defb10087609222 SHA-1: 4bfde781dcc4edac23e9cdb3010d779a573788eb SHA-256: bb610a1d889df34fd2e40f5bcd26bd967e2bb646238a24e6a053ef837db705c1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://vilenefex.ru/wix?keyword=rbi+exchange+rates+usd' is a primary indicator of this activity.

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://vilenefex.ru/wix?keyword=rbi+exchange+rates+usd PDF link annotation
    • https://cdn.sqhk.co/xutijexop/6gdii3G/xukipekugawapatuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/fiidCj3/ziruxego.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/eVwhbif/sweet_fruit_candy_games_download.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/rogebutuwujedewenizivaw.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/9ecdf84eb7.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/23a72eb40aa00e.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/c52101d9-04e9-4cba-881f-5b0d52df100d/surelazuwovorapited.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_50c2f513ce2e40398faa22da3d5ccdf8.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_38893b2f0dc0452bb266e976bd7e3d7f.pdf?index=trueIn PDF document text
    • http://resomaxijudutuw.epizy.com/33904981280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19f0fd7-253e-4a21-9f25-20d2dc3d9409/59124826096.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_67b778e9bc974e899489b593eed176b5.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_29b81d6bb73c4418bf2b07e36116fb68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9423c388-00a5-47bb-bcad-43f4cf81c8f3/95580710620.pdfIn PDF document text
    • http://nazedizabif.rf.gd/solution_manual_heat_and_mass_transfer_cengel_5th_edition_chapter_8.pdfIn PDF document text
    • http://mugafazeporose.epizy.com/betenoritiw.pdfIn PDF document text
    • http://wopitinoxolo.rf.gd/ford_focus_2004_1.8_tdci_engine_diagram.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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 5156 bytes
SHA-256: 7e026cfac5d50e34ad1989d924ab8a0a7bd5b3e78a35db7c4852a584898ee7a4
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 11312 bytes
SHA-256: 55e1ba42ab5a019e6eab5b5775a12246ef3e837849962c3ab197361025c4690b
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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