Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a481206f54a457…

MALICIOUS

PDF

98.2 KB Created: 2021-04-02 16:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5d658c77ffce93a2831da81321020878 SHA-1: e8a81de91b1aa3dc58d9805e8c42a5af6dae0df1 SHA-256: 78a481206f54a45769f3ef3df8d6696c6da171de5ce7af27ff7077ed916c2f17
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one notable URL with a 'programar baofeng uv-5r con chirp' query parameter, suggesting a lure related to radio programming. The PDF structure and link farm heuristic indicate a deliberate attempt to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=programar+baofeng+uv-5r+con+chirp PDF link annotation
    • http://tideboweped.medianewsonline.com/street_map_bangkok.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/fovezexivawinixom.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/98803658532.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/fb754aa633.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/44373091501.pdfIn PDF document text
    • https://rijixovo.weebly.com/uploads/1/3/5/3/135339233/5928c800.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/jjiwjhw/fovorule.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/hgjghjd/38604074979.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/bachelor_of_education_unisa.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/mockingjay_epilogue.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/ibkuide/the_great_courses_app_review.pdfIn PDF document text
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/2795450.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/one_touch_ultra_2_battery_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/3L8cVrS/birdy_the_mighty_evolution_raw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotudokizer.onlinewebshop.net/juradigegazega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992a04c3-ae52-4d4a-993c-88a1acebfb29/ley_de_propiedad_horizontal_en_venezuela_vigente.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/are_furnace_limit_switches_interchangeable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83aa1cb6-6805-4876-87b1-7dd915b14d9f/69567783495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1863cfa9-1750-48b2-bfcb-0992ef044e36/33048412494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9670ad7b-e6b6-4bca-96bd-0ca159c64983/pibesewiso.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/aparato_respiratorio_aves.pdfIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/96124793258.pdfIn PDF document text
    • https://amzn.to/38yc1oEEmisoraIn PDF document text
    • https://amzn.to/2OS4WY8CableIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 5576 bytes
SHA-256: 2f5b1902ff64c02983eeebd134ef52a5419e832239393aa565abbdb52c12fe9a
font_01_sfnt_off00013c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 12884 bytes
SHA-256: d686663599f884b790b28bb13eb45e53ce8078a16d05bfed609fd882da6eaa71
font_02_sfnt_off000165f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F8 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15