Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3816f1f0d0cce6e…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 08:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b841d1d7ff334cad6dc22d2ac4dfabf SHA-1: feb5d535e8e1d50d844d23589b3d64f4e15e4d90 SHA-256: b3816f1f0d0cce6e737912673ae06ee193f814bb6c5631037d6b5f9891e34f1f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs that redirect to websites offering software downloads, but are flagged as malicious or unknown. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple disposable domains and link farms further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8682

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=autocad+xref+manager+download PDF link annotation
    • http://murerejomijuv.22web.org/vezenojeduguxobenekojew.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/bje3RLs/tenekakuvuri.pdfIn PDF document text
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/sosunozune.pdfIn PDF document text
    • http://monongzhlh.space/ditemozejexezekazomararan0x1v6.pdfIn PDF document text
    • http://repochka.site/tonal_harmony_textbookbsons.pdfIn PDF document text
    • https://cdn.sqhk.co/dasoxitif/HjgjaWu/orange_money_niger_transfert_international.pdfIn PDF document text
    • https://lusugola.weebly.com/uploads/1/3/4/5/134599647/pujeninaxovimiv_sokepizotamutew_nowukipasa.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/xurom-bokujizaxapej-vijaban.pdfIn PDF document text
    • http://kukushpa.fun/bolne_wala_tota79e4b.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/iijV3ow/telonuzetimova.pdfIn PDF document text
    • https://cdn.sqhk.co/xobakidanav/UggigIF/zidumifapadukusug.pdfIn PDF document text
    • http://pejefekivuvofun.iblogger.org/pupudal.pdfIn PDF document text
    • http://blaugrana.ru/arranged_marriage_book_downloadwjt46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fde495cb11e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://novozozoto.epizy.com/katedumiwoxunasik.pdfIn PDF document text
    • http://vabusak.rf.gd/samsung_un28h4500_manual.pdfIn PDF document text
    • http://viveguwoxifug.epizy.com/how_much_is_the_bar_course.pdfIn PDF document text
    • http://nabarosurugi.epizy.com/best_website_for_free_powerpoint_templates.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 5148 bytes
SHA-256: 6c07e2b49b8dd9fbb258e9812fd490d654dd99af70ccc23867c642f2cefe5cb3
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 10452 bytes
SHA-256: c6d5426ec18a995de6e7de64297d201a5f838898cecfe5a8f68f6ec0684e1912
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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