Malicious PDF — malware analysis report

Static analysis result for SHA-256 c447b83ffa4ce65e…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 11:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e1bdec6fe4ba5a4979c26e594e1ee393 SHA-1: f993fec74c2fa7f9fe3ef812a90883fce96979fa SHA-256: c447b83ffa4ce65e334222a560b452cd6dc74dbf6bc55b472e353aa16c72ab25
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "PDF_SEO_LINK_FARM" that points to various PDF files, including one that appears to be an Android application package. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=2nd+grade+phonics+book+pdf PDF link annotation
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/nuromisegox.pdfIn PDF document text
    • http://vnds-v.website/movie_director_simulator_hack_mod_apk6klxd.pdfIn PDF document text
    • http://100p-f.ru/navy_scuba_diver_pin6b9lg.pdfIn PDF document text
    • https://buvefejam.weebly.com/uploads/1/3/1/4/131453018/kemonav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/big_bazaar_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/18839460935.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/action_blaster_south_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/hotel_room_booking_form_html.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/filmora_9_full_setup_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/51485704847.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/98098343797.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/xoxufovajudifulomik.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/mandolin_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/55261048539.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/how_do_you_cite_an_internet_source_in_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/agent_vinod_full_movie_free_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/cotton_bed_sheets_set.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/over_40_hormone_reset_diet_shaun_hadsall.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/27421344321.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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 5624 bytes
SHA-256: 590ea02b13e76b5deba53efc5db7776ce5fc574596095a944e479d4cd8665cea
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10780 bytes
SHA-256: 3280bb1fac0ad1358a8f6021db19ca68c9d88bf788727dcfdaa78b067a99498f

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