Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c8c73f2110f681…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 00:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ab28dc890cd1b9c985a6f19c5736cc0 SHA-1: 2518ea300a92355a6ca62bbdcc75978a4e133f73 SHA-256: 21c8c73f2110f681451977d17c1a5126f67ab10bd49ea1d96658367e2eabc996
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL suggesting a lure for 'blank calendar pdf free', likely leading to a phishing or malware distribution site. The presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://midufefew.ru/award?keyword=blank+calendar+pdf+free PDF link annotation
    • https://cdn.sqhk.co/manowipete/eSyjc9Y/purexudekot.pdfIn PDF document text
    • http://nafanesowijim.iblogger.org/zinodujipugelenagipov.pdfIn PDF document text
    • http://dlkmvkoenv.info/kasusureviribidexuvixhx0op.pdfIn PDF document text
    • http://kabejorudedofom.22web.org/i_c_d_s_ka_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/emiiRWr/life_is_strange_2_ps4_pro.pdfIn PDF document text
    • http://paktum.pro/lowedugawoxatwt9np.pdfIn PDF document text
    • http://jotupati.22web.org/bowikilunonobazobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/gawarebadal/4jYfiij/harry_potter_bloody_hell_gif.pdfIn PDF document text
    • http://dmdmassage.com/cmhc_rental_market_report_2018j5lu7.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/gNC8jae/stick_war_2_unblocked_full_screen.pdfIn PDF document text
    • http://mutinujevax.22web.org/gumogifugixisajef.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/UGhavKd/evacuation_day_boston.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/fJxzpjc/bravelands_book_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ggg6N6Z/16573264785.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/ggeWfSW/power_rangers_all_stars_hack_apk.pdfIn PDF document text
    • http://nowtorrentz.com/21281358561k3gxs.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/qCjeqia/inflatable_water_bounce_house_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/jihjfie/33670027133.pdfIn PDF document text
    • http://rifubabesepa.iblogger.org/apsa_citing_format.pdfIn PDF document text
    • http://psychologyrelax.xyz/felewanejivabalolubumexl7zym.pdfIn PDF document text
    • http://sberpodarok2020.online/53609032403w1a4u.pdfIn PDF document text
    • http://snegny.com/charlie_puth_how_long_remixzqvvw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jinagafudolugil.epizy.com/ny_take_5_results_and_analysis.pdfIn PDF document text
    • http://mironowagiseb.rf.gd/13157330185.pdfIn PDF document text
    • http://nivawuxiki.rf.gd/the_killing_joke_ending_quote.pdfIn PDF document text
    • http://favugilodufim.epizy.com/99666009903.pdfIn PDF document text
    • http://zarezelokuka.rf.gd/kiwof.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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 5084 bytes
SHA-256: 7ef6b88318b275d142580280906461199e3d4ad0d278ad1d7a5468668ad8c88b
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 10976 bytes
SHA-256: c9118e9f5e39e882bd077c0153f8825d3e8aed558bd207e0e2705716ed10c429

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