Malicious PDF — malware analysis report

Static analysis result for SHA-256 4613f4b2f1902133…

MALICIOUS

PDF

85.2 KB Created: 2021-03-04 16:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6bcdc6ddb009614b3edc3629adbcf998 SHA-1: a2ee75e95b7424a1526649bd796378e9e1df5e7d SHA-256: 4613f4b2f1902133035d2aca8f7786d73550940bfb6486c0a356c7067d1fe88e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are characteristic of lures designed to redirect users to malicious sites.

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://mezovuduw.ru/strik?utm_term=how+to+write+an+introduction+for+an+essay+4th+grade PDF link annotation
    • https://cdn.sqhk.co/nogugojuri/riiegcD/8_ball_pool_unblocked_games_76.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/rutubiva.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/1f267b.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/7ohb9ii/90172543115.pdfIn PDF document text
    • http://canonsburglake.com/fiddler_on_the_roof_jr_tradition_lyricsibibi.pdfIn PDF document text
    • http://copyright-supporthelp.com/callapp_premium_cracked_apkhbnfk.pdfIn PDF document text
    • http://opssmall.space/janativilinigikeno0esai.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/wikekulatotuzobopo.pdfIn PDF document text
    • http://geosen.net/how_to_create_wallpaper_for_iphone_ios_14p7kbe.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/WEGn2ge/10897323680.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/pdBggje/fesiligaguz.pdfIn PDF document text
    • http://fresh-ita.fun/25419510077dptyn.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/pobosamilet.pdfIn PDF document text
    • https://kiragidemi.weebly.com/uploads/1/3/0/7/130775435/b590679.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/4480996.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/47899f48-ed70-4334-9090-cb20f52ac079/where_do_i_oil_my_kenmore_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da47e2e-dcbf-4167-9e0a-184cf2348645/english_dictionary_app_without_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/where_to_buy_primo_water_dispenser.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/chess_analysis_engine.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_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 5492 bytes
SHA-256: 1054fab49147b2ceb56ad28f685df418c31f343f9b1f457ea63fa77b4792c982
font_01_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 10532 bytes
SHA-256: 89cca57a977cf89115aaf31c0a9d6cab18264c1e63187c15d398dd2658595f24

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