Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a81191ae754cd81…

MALICIOUS

PDF

81.1 KB Created: 2021-03-25 03:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: da0205ac6b583a34aef9bba2e78b6f9c SHA-1: d31c98d5a72c7ad51ecee14f67e27a1250ba9654 SHA-256: 2a81191ae754cd81eed6d80066621978896adb2ce97a99c6535041d0f7d7e3a4
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing lure disguised as a resume template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=computer+operator+resume+template In PDF document text
    • http://niburufajanuto.sportsontheweb.net/30459190866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_5feff391a81fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_600a16a87ec09.pdfIn PDF document text
    • http://dreamingdeveloper.com/barbie_dress_up_games_for_pciyaj1.pdfIn PDF document text
    • http://shimano-stradic.ru/615290970142kjgv.pdfIn PDF document text
    • http://dorightschool.com/calculator_apps_download_iosg9wlq.pdfIn PDF document text
    • http://brumbum3.xyz/como_ganar_amigos_e_influir_sobre_las_personas_epubgratiss8lre.pdfIn PDF document text
    • http://retys.fun/84769538762lw396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ffae8ace5dbc.pdfIn PDF document text
    • http://gatorama.fun/wamilotexivrvd6y.pdfIn PDF document text
    • http://yourlivehelp.com/nuwebowelaburijaxuxelnjtpk.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/mapa_turistico_portugal.pdfIn PDF document text
    • http://reabook.online/21390529812ndit9.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/beads_making_business_plan.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/bissell_big_green_cleaning_machine_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_600b6cc672cee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89c913a-04a3-417d-a410-7eaa6d0712b1/how_to_look_at_normal_distribution_table.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/cartoon_network_comedy_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/adobe_illustrator_cc_2017_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4216ab6-d2e5-45a9-b496-bf44b37f65df/41969492200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9451d803-6465-49a2-9abd-511b21efa000/put_on_the_armor_of_god_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/vakabigor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1645d2-3a96-45e4-b692-ab15f2b9f752/54692967028.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/bithiri_sathi_songs_dj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fdc6b9-a1a7-4471-8974-d0b7ceb09b21/painting_ideas_for_beginners_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/34931482697.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_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 4868 bytes
SHA-256: 5f7d2b59f9f5ed3475acbad43d1883d24d8faeb9b147acbd1170de77bbcacefa
font_01_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 10652 bytes
SHA-256: 56de0c32680e3d9eeaef9d4d722da8f62ab41d573b55f18167f08dfcb527da37