Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecadb742113d931…

MALICIOUS

PDF

78.9 KB Created: 2021-05-01 20:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b4e38a489b601dda34cc8bda9d2eaf31 SHA-1: e73fa9432baea06f6a647d3c97d92e5f19ea7abc SHA-256: 7ecadb742113d931cbe04f53c84c72733eb5ff96390503fd3bca3220f32fd5fe
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites like https://midufefew.ru/strik?utm_term=black+ice+on+road+today.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=black+ice+on+road+today PDF link annotation
    • http://sudesisobibimit.22web.org/47948504004.pdfIn PDF document text
    • http://ninudogexefeg.22web.org/canonical_transformation_poisson_bracket.pdfIn PDF document text
    • http://mnogoturov.com/zener_diode_sot_23_datasheet2sy2l.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/gjUhh0l/19945628869.pdfIn PDF document text
    • http://private-channel.site/integration_of_hyperbolic_functions_worksheetl98b4.pdfIn PDF document text
    • http://zabozel.iblogger.org/6095614414.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/Rkzjdgd/counting_numbers_worksheets_for_grade_2.pdfIn PDF document text
    • http://bellissimo.online/nujudiwadivoboletijawuzywwkr.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/fgd5ggB/wukife.pdfIn PDF document text
    • http://lngcliente.com/birozaxixikudonizutalowig97ax.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/ashoka_history.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/5GYia6N/flippy_race_hack.pdfIn PDF document text
    • http://pogadai.xyz/23006516655cib0i.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://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_46d63315b771414581858a8963f45107.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_247e79d990ee45208a33841ab9494787.pdf?index=trueIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_c5270b834af74e0d9a3704523cb11541.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_0a48c90a4edc41c4a07956b3d2badf1b.pdf?index=trueIn PDF document text
    • http://fojupejededoto.epizy.com/boxazenuwagefokupodajeri.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/xorogisi.pdfIn PDF document text
    • http://bofodegekero.rf.gd/24792233880.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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 4756 bytes
SHA-256: b17f938a0eec44495ebb182c5e6a939fe993e09b1a27859abfb0a51b91adfd33
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10624 bytes
SHA-256: 64e2d45348d429f4e5de43809bc58045f188cd5ca3886e223e7999472fb9b3b0
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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