Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c8dfe84f572a2f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-04 03:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 57014c7de78e061787a495a9cdb4fcce SHA-1: 442d6ee27e2784f1be490da2c66cfba35121c9a6 SHA-256: 73c8dfe84f572a2fd46a055e67e20bb0671acbaf5bcc30209c4fb6607d153f6a
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://druttle.ru/wix?keyword=ccna+200-125+wendell+odom+pdf PDF link annotation
    • http://fafazegadaxe.22web.org/57450866065.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/gM2d8I5/no_limit_racer_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/nadudegimew/gAiglhh/peppermint_candy_rotten_tomatoes.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/bowanedukiwubitebuxorud.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/perodijiwiledawaxerofobo.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/can_you_connect_n64_to_hdtv.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/N7D1Oij/bombay_hair_curler.pdfIn PDF document text
    • http://bodulagas.22web.org/lavenikamujorupij.pdfIn macro / runtime command snippet
    • http://xitodefigatefuj.medianewsonline.com/how_to_scan_on_hp_deskjet_2512.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/jcgdT2X/84915274577.pdfIn PDF document text
    • http://lusanubi.22web.org/19795824717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/rational_numbers_examples_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/85725277500.pdfIn PDF document text
    • http://zilomit.epizy.com/mulisuremebo.pdfIn PDF document text
    • http://bajazet.epizy.com/mekotizugijupuvexigemo.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/5137036055.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/zulamelopodiladago.pdfIn macro / runtime command snippet
    • http://risozipenolifiz.rf.gd/959375526.pdfIn macro / runtime command snippet
    • 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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 5508 bytes
SHA-256: 9b6d660a263552ef3cb6ef7e4d90657339a0208f26382263e2cf02019dbf0887
font_01_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10452 bytes
SHA-256: 0710440323b57256eb3828b6396fe2a2f7783110e4a0f09001f3bde4712a32e4

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