Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c3b0dedd9efc8d…

MALICIOUS

PDF

77.9 KB Created: 2021-02-17 10:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b75ba0fbaa7950e31a0e3b8eec123e0d SHA-1: 6e7b3d41d70d0fde178f58c2828a03c8bf0504f5 SHA-256: 48c3b0dedd9efc8dbbbaa972e8ba6a81e104ed60f2d0d20af36faf064cce58fc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=bruin+history+webquest In PDF document text
    • http://braco.ru/64791259176phdzi.pdfIn PDF document text
    • http://websporizle3.com/mitidata65mkc.pdfIn PDF document text
    • http://blog-millionaire.buzz/55536416059d10ys.pdfIn PDF document text
    • http://agentsoft.space/gas_station_2_highway_service_game_download0lgtj.pdfIn PDF document text
    • http://choosemadam.site/demulajodaguxovowarikadsrsn.pdfIn PDF document text
    • http://huaweistoreukr.xyz/xosajubatljz4.pdfIn PDF document text
    • http://kuxasubofutako.iblogger.org/parse_error_fix_using_apk_editor.pdfIn PDF document text
    • http://pink-echo.club/3019481759134cpd.pdfIn PDF document text
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/punorokob_wulonafub.pdfIn PDF document text
    • http://moviesaddaa.online/77087942259zcxo6.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/4604192.pdfIn PDF document text
    • http://classkaod.ru/grid_photo_maker_for_instagram_mod_apk7mfrk.pdfIn PDF document text
    • http://doctora.club/how_many_carbs_are_in_sonic_popcorn_chicken5ooma.pdfIn PDF document text
    • http://leree4.club/podovolutezenumilegen1t1n.pdfIn PDF document text
    • http://sayseedokg.com/zombie_hunter_sniper_mod_apk173no.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/tetabazigevuxuw.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/54c81f7db8f926.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/aquarium_camille_saint-_saens_piano_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegeduv.rf.gd/66391556336.pdfIn PDF document text
    • http://pabudixobo.epizy.com/nuwurugetesekasixidamu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e561.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE561 4176 bytes
SHA-256: 2c2aa66ce241a4ed06df7d3648ab1135dc4d022519bd37ce7e2f58ec98e00a92
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 5040 bytes
SHA-256: 702493ee0389d3027b5b17660c788459936a6f5a83a87cfab1d0bbf8f9f288ab
font_02_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10936 bytes
SHA-256: 5887bd2d710336de14139454125e95ecb420c6794e1107d53761a89cfd5075ba

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