Malicious PDF — malware analysis report

Static analysis result for SHA-256 3818fd97c4e7550f…

MALICIOUS

PDF

76.5 KB Created: 2021-04-03 13:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 292ac75061d073000620cfab758132ec SHA-1: 56045c043910f0d04b84b51868fa68b53d51e0fc SHA-256: 3818fd97c4e7550f140f5741426e7d08dce482884887e46cac289eb07a8e7507
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 0.9996

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/award?keyword=bertch+cabinets+pdf PDF link annotation
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/sofejuw_jirovanilado_guraviga_tazefipo.pdfIn PDF document text
    • http://nonusegotipijij.iblogger.org/limibenapopumudetuxojosiz.pdfIn PDF document text
    • http://winelorasagi.22web.org/wakemizutewub.pdfIn PDF document text
    • http://lixamewura.iblogger.org/lodukison.pdfIn PDF document text
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/3959470.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/9fmniaL/demon_s_souls_dragon_god_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/mDIvhij/hardcode_vr_game_download.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/black_sabbath_war_pigs_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/Veiddhh/71793321630.pdfIn PDF document text
    • http://axecheat1.xyz/vesunaxodif6npo.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/mqJmghy/lovaxubojogajeg.pdfIn PDF document text
    • http://mishgen.com/revista_boticario_ciclo_4_2019gmdkp.pdfIn PDF document text
    • http://garant-ritual.online/army_opord_example014li.pdfIn PDF document text
    • http://bitsracing.net/kumiro1am1n.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/hdij4if/borderline_personality_disorder_symptoms_test.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/wevumizixosivo.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/wsvhaih/53881711182.pdfIn PDF document text
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/nawepid_volip.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/Nnhdiib/gufevexob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruludamena.epizy.com/87262639295.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/volume_of_composite_shapes_worksheet.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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 5400 bytes
SHA-256: 8cc9d9001f4042f5f521d1e07366feab9c6297f07bb22c23b7f9418cbcefc22a
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 11112 bytes
SHA-256: 227733bb0a80b6780ee39736077400e696d41ec5784ac807bf14ea6d3476a484

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