Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a66c0753e5132b9…

MALICIOUS

PDF

90.7 KB Created: 2021-02-25 17:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54ce419576a480c28a5bb27cdb160f08 SHA-1: 57a9972b03ac6caeca4ed2f2a7b6946418e4dd84 SHA-256: 9a66c0753e5132b95fe70add92a68f607a3921ad768aab024b69aec2accf242e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=ingenuity+cradling+bouncer+washing+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5feaf28e49474.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/farijoletibupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_5fd0bad120682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_5fd7a362b1a2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5ff258990158e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_60374455bc91d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://donijexufenu.onlinewebshop.net/is_an_ak_47_more_powerful_than_a_ar_15.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/nojafoxikukofivafoxapu.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/28132141287.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/what_is_economic_freedom_fighters.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/rosuri.pdfIn PDF document text
    • http://medexode.atwebpages.com/11927810370.pdfIn PDF document text
    • http://lafeseg.rf.gd/how_to_identify_eaton_fuller_transmission.pdfIn PDF document text
    • http://litaxuroba.rf.gd/lejusexobi.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/what_is_casual_leave_in_india.pdfIn PDF document text
    • http://wasaxeradiko.rf.gd/74601958005.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 5356 bytes
SHA-256: 2b5b5d8787aa69e0312e9418348879b018cf1e4f17a21637479ee92d5dde63c5
font_01_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 13848 bytes
SHA-256: 4fd2df706489b61856d0d3825ed042ca98aa0f721733aa558905c29bc697767d
font_02_sfnt_off00014f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F33 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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