Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fcb52b9cc364a4…

MALICIOUS

PDF

75.6 KB Created: 2021-03-11 22:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7aad14760db31b2c08fec923cc27c725 SHA-1: 171676b702fbed53cedb3bb72a7c03bb900fedc1 SHA-256: 48fcb52b9cc364a464e33c955e01970cc0c119695f37606d2300e2ce0bc566da
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/123?utm_term=westworld+season+2+episode+6 PDF link annotation
    • http://termometr-medikal.site/master_the_boards_usmle_step_37u7y0.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jjdgcDd/58745299156.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bghRiho/windows_computer_launcher_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/iiXPkOT/videosplayer._net_free_download.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/rojiwemeroloronatupi.pdfIn PDF document text
    • http://carins.info/xugajasojegulatodofamodazuoun.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/PIja5hb/sandwich_factory_lancaster_pennsylvania.pdfIn PDF document text
    • http://lastasked.com/kegatifitakunokurug5v535.pdfIn PDF document text
    • http://kukushka.space/powerpoint_presentation_templates_free_educationsqpib.pdfIn PDF document text
    • http://airbin.top/nanomunojumulisebilofesif34hv.pdfIn PDF document text
    • http://bigno.space/77798598637idwgn.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/d1hfFhi/plus_messenger_desktop.pdfIn PDF document text
    • http://befipekawuzader.iblogger.org/13_merit_badges_for_eagle.pdfIn PDF document text
    • http://goodik.fun/buvoxemipoforiwpnhp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_cd48165b56c44e5594a322f9e7d2d9e7.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_4ddfa737343747229489585cda255eb8.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_7ad159e663c24ec79cf964f89c7d65b0.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_7bea240f39f147d388fc4681bfbdd454.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_9a62afb86d0c4c8da6b7931711c2f31b.pdf?index=trueIn 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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 5344 bytes
SHA-256: 84156496df224e71b89c5e836d46283a9fb9df4303e2a75c09c8bd95b4b237cc
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10488 bytes
SHA-256: 4b3d230fbfcc87f5ce55a995f8d8f450afee6d1fcffc90d3e8b66f95e438cc93

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