Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5e67e42708c43…

MALICIOUS

PDF

83.7 KB Created: 2021-03-30 08:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dd5af2d879c0451dc54f3a52c2234657 SHA-1: c08e304a423700111a35832e206c9e571ef7ce60 SHA-256: f3b5e67e42708c43cf922796a6fbc3c04b3adaa2d63a3c87dca0de7ae852e682
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious content. The document body, though heavily obfuscated, contains text related to 'operating system not found' and 'acer laptop', likely a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/strik?utm_term=operating+system+not+found+acer+laptop PDF link annotation
    • https://cdn.sqhk.co/mesafovojifo/5jaie7s/41593600420.pdfIn PDF document text
    • http://nimidarizul.22web.org/kupajewixukajadenoxisiru.pdfIn PDF document text
    • https://buseziji.weebly.com/uploads/1/3/1/3/131398529/botigusivo-jovanosejuzate-kojagezu-teforudiwepifok.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/6314061.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/Tmkcgj4/gared.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/cCLSiid/7138903436.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/wojozorufuwopuvaxur.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/gggA1ie/95548090304.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/08a22.pdfIn PDF document text
    • https://gabijuwi.weebly.com/uploads/1/3/1/8/131871583/5ba832748dd.pdfIn PDF document text
    • https://cdn.sqhk.co/pimabosi/ghdQijn/flower_garden_plans_for_full_sun.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/puziwavow-lopatu-wivawogegumupi-nubuvuzumudowi.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/zusovadaf.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
    • http://vawanumezal.onlinewebshop.net/tiranotajuvasofivos.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_a1de5803f7df4a16b3fc7dde7b526286.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widetunipet/vokogeka.pdfIn PDF document text
    • http://vawofirulev.myartsonline.com/jasakemojukexo.pdfIn PDF document text
    • http://vutevesofu.rf.gd/manaxozod.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_3807d8b0ddcc48789f6ad061162b66a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/bioethics_a_nursing_perspective_6th_edition.pdfIn PDF document text
    • http://sodanone.rf.gd/tratados_internacionales_firmados_por_mexico.pdfIn PDF document text
    • http://xubudexev.epizy.com/nikurupebexixi.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/lodij.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/ambulance_uniform_shirts.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/26195763503.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_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 5488 bytes
SHA-256: 00cc89d7b76eb201e2a1e74cb2c68ad4e7976cb1dac3356e30f382106b5a4b4a
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10700 bytes
SHA-256: 3861b6242ed6a3af130e6395954d5f2a8d448df04cd39ce800f24d9f9b75afe5
font_02_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71