Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d54ed9d73251d9…

MALICIOUS

PDF

76.9 KB Created: 2021-02-24 18:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a4a7dc87b2b5c1245313187152489aed SHA-1: 89d28ac47ea85fd8b11169a813ef6a08f237389f SHA-256: 88d54ed9d73251d91c757ea646725c08c72e20fd34803216dd0181bbdd7837f5
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://seumenha.ru/wix?keyword=spider+man+homecoming+online+free+reddit PDF link annotation
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/1d5367c995.pdfIn PDF document text
    • http://ezfix.asia/706761247822baz0.pdfIn PDF document text
    • https://letobepep.weebly.com/uploads/1/3/0/7/130740206/bodukagemuwusonorimi.pdfIn PDF document text
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/vowaxet.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/juroneguluxotuxufo.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/descargar_audio_biblia_reina_valera_1960_mp3.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/transformational_leadership_in_nursing_practice_challenges_and_strategies.pdfIn PDF document text
    • http://xawinagolagiju.iblogger.org/fisegororomiguzonobidonam.pdfIn PDF document text
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/tilovofuv.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/womaviduxej.pdfIn PDF document text
    • http://wofomeko.22web.org/responsive_landing_page_templates_html.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/pitakajizol-zogewebasu-suzomupilux-gamigawuxovexel.pdfIn PDF document text
    • http://vovpomnim.ru/free_template_cv_creativehj4ov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilepobafomunow.atwebpages.com/samsung_grand_prime_pro_battery.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/83881432147.pdfIn PDF document text
    • http://tawegimasozaj.epizy.com/abdul_karim_khan_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/irs_publication_525.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/modinagamebatilo.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/beyond_biocentrism.pdfIn PDF document text
    • http://ninalosuza.rf.gd/93771139891.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/pugalo.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_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 5496 bytes
SHA-256: ec1e6126303c0d577ab27ef0b60720d3b8b7aa349fb8fe97a91b3b97e0b727ba
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 10268 bytes
SHA-256: 2ddc1b41bae328d23472da8892beb77b916e02f3c898ace1b50c9aaee44094e4

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