Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e254e360b2bac21…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 04:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13de552f95ff9da17bbd470a3f1794af SHA-1: 10eced8d96798c614fd1cef2334f429bfc6df398 SHA-256: 8e254e360b2bac21c211581e18ab8b8979f97a68206ffbe8fde0de509cf206c5
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 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=buen+viaje+level+2+repaso+b+answers PDF link annotation
    • http://mirror-x.org/54359943482ek3iy.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/lgd4mgd/animal_restaurant_game_fishing_pond.pdfIn PDF document text
    • http://reduslim-shopofficial.site/fefagolimonakepemomnfkfo.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/bjbzgd5/rumble_in_the_bronx_movie_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/wotedimozer/GhjkMjb/crossfire_x_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/fjcWmjd/91693921042.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/ibejcij/78685965123.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/gcUpnjd/download_game_neon_chrome_mod_apk.pdfIn PDF document text
    • http://trixy-matrix.space/58345738374hd32r.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/libeganot/27854948969.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/avatar_gaming_logo_maker_apk.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_66141a4efd7d46dd953c8e34ab8350ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1c221d-b806-4de8-9387-ce74e0415efa/how_do_you_reset_the_master_code_on_a_yale_lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b752c3e0-f58e-40f0-81eb-5adec3b5a03c/26571035218.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_0081ffaf172b422cbfa721e879c4731d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/11851223397.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_9ae762f13e13475fa09eba2da58a323b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/fofasiwabixekalovapujal.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/lerofewiz.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5364 bytes
SHA-256: 0c6ba296278bf775fc84264a0765503ff7102003523b0b04fa268bd9a83d3933
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10756 bytes
SHA-256: d448beafd3a1e050bf8fc6a8a9d6aba15ac755aa850c67a6da10063b6fafbe45

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