Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1d25d61bbb3f79…

MALICIOUS

PDF

88.0 KB Created: 2021-03-21 07:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0574e666dcd2a61fdbd28544c7a2f2a5 SHA-1: 290cd3a015540bf6374e1c4523d98f6863898e7e SHA-256: 0d1d25d61bbb3f79f4b095a377b3e05ba6fb177c77b3d7630dffaa1d733c9718
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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/strik?utm_term=clasificacion+de+los+numeros+racionales+e+irracionales PDF link annotation
    • http://dukepiweg.iblogger.org/2825417348.pdfIn PDF document text
    • http://senteber.site/javufazigovexeroxwy8yn.pdfIn PDF document text
    • http://vehicleusains.com/45656091130xcq53.pdfIn PDF document text
    • http://tehnotop.space/leadership_interview_questions_and_answers_samplebwf19.pdfIn PDF document text
    • http://mubufuzit.22web.org/autism_diagnostic_interview_revised_adi_r.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/dquyifF/zujexigetoj.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/ZigzhjC/tie_dye_kit_amazon._ae.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/bjdhjjc/resort_island_tycoon_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/eLRW2ia/cute_wallpapers_for_computer_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/ngjyiOS/buzz_launcher_apk_premium.pdfIn PDF document text
    • http://dreamingdeveloper.com/how_much_is_a_used_citizen_watch_worthd55ll.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/4hjchjq/45987551848.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/jh2HuZJ/3918130081.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/iHifE2m/sefap.pdfIn PDF document text
    • https://cdn.sqhk.co/murofoli/fd1Rjad/human_body_worksheets_for_kindergarten.pdfIn PDF document text
    • http://carishr.com/544170704218eh1r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_1512e68c69314af39ac61e356ff7043e.pdf?index=trueIn PDF document text
    • http://poluxik.epizy.com/28165531702.pdfIn PDF document text
    • http://mikugux.rf.gd/zezesugi.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_bbcd07acd379449da759809829154ea7.pdf?index=trueIn PDF document text
    • http://vibesegajepo.epizy.com/49625497107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1c850d-d3c0-4334-9455-91b67d63a2d1/jokuvudugalur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99772a1b-b919-4f1c-9dc7-e4b42d670c2b/32853809558.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_d2df316b52c24f4190036a1ad0fc157c.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_4ed74aa1dea44cb6b25d8ce5057b7dd6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 5072 bytes
SHA-256: 535457518a59429156c6d0f085451b4ca33c42a5091d9abd2b822d6dc354d814
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 12676 bytes
SHA-256: 419a92dc8171bf9c6fcd52518f94385ba382a8c1e52c20f563e276c22bf867c8
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 16476 bytes
SHA-256: 5df697a64b0c1d49f73f608dd857aaf1cb05cef24d275c14bcf921f8f815ec25

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