Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd9cd0c2146f0fd…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 02:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 91b97a0a15b962f187408e91b28d3f7d SHA-1: 5239e11e8905d349842b06427a89d3cc807af613 SHA-256: 3fd9cd0c2146f0fdc7b5671af083871c389c9ac81d8637fc535e8d44b1572191
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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/123?utm_term=alimentos+con+carbohidratos+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde8646a89a3.pdfIn PDF document text
    • http://lukukitufegaxib.22web.org/completing_the_square_worksheet_kuta_software.pdfIn PDF document text
    • http://voiprormul.xyz/innovative_technology_itut-201_usb_turntable_manualx01sd.pdfIn PDF document text
    • http://fipifet.iblogger.org/69707073667.pdfIn PDF document text
    • http://temppicture.xyz/notutubosuwazuzojugojufuve9m9s.pdfIn PDF document text
    • http://uptodate.site/edgar_allan_poe_the_raven_explainedhjw8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ffa78d84ede2.pdfIn PDF document text
    • http://b2b-servis.ru/8477671949ifls6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5fff5b25db850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_6c8d87138caf444da051e6003975b454.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e7fbf684a814408197216f9619aecee4.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_4f630cfc74ea418ea1b935fc1aa56bd5.pdf?index=trueIn PDF document text
    • http://baguzakanaso.epizy.com/assamese_whatsapp_status_new_video.pdfIn PDF document text
    • http://navasegekukuj.epizy.com/josamosukigitexipoxefe.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_20e8cdd650a94a55b19448e5c58f2b6d.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_1b6c8c7825d64f93ab3cd231036d3c0d.pdf?index=trueIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_bc912f9c4458493181aaf88b473c3d3c.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_6d5c2ebab32d4501a203485ff57fd272.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_b6c16065460044dd998216cfce511c17.pdf?index=trueIn PDF document text
    • http://dimizisunope.epizy.com/xotowuxiwudojinofiseki.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5524 bytes
SHA-256: 1a2ba5f5693e0500ed78ce7f402cf2723e17dfd4606a2d2d69f6f7bca1b14dbf
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 11872 bytes
SHA-256: 3f96eec20a2f220f39b6e7ca3df6fba471ede8a90e9dde192ef016099bfed8bb

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