Malicious PDF — malware analysis report

Static analysis result for SHA-256 33aeffcbf1a8c453…

MALICIOUS

PDF

95.6 KB Created: 2021-05-01 04:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e422b2ce0aef207e8e0ca5abeb604dfc SHA-1: ee891ea2c154f5473fd63bbbb516b7a3bc6a40d6 SHA-256: 33aeffcbf1a8c4531ac8bb24ca803b68a0ab089e356d834b8a290594c9029cb8
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=probabilidad+y+estad%25C3%25ADstica+traduccion+a+ingles PDF link annotation
    • http://tuwasukam.getenjoyment.net/gekinezu.pdfIn PDF document text
    • https://cdn.sqhk.co/kirinitaxuk/UhhqWhi/sony_rewards_points.pdfIn PDF document text
    • http://bewudewumit.sportsontheweb.net/algebra_2_factoring_polynomials_worksheet.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/easy_classical_guitar_songs_for_beginners.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/bruno_munari_das_coisas_nascem_coisas_download.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/67828039924.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hfAgdhi/stack_smash_2020_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/aheGCU9/meteor_shower_tonight_time_to_watch_in_california.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/wekibik/nepamujasafek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200a86e0-6822-4a6a-acb1-c5fe480c3769/zikiwudeboredigodalojus.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/bijuworugobidevuxunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c88a6dc-c8ad-4a07-89a2-f05d33663ba8/48779366988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc313cb-7740-4f77-9fb4-dfd50e99e62f/joxisegesezavuxelemolakax.pdfIn PDF document text
    • http://jekurur.atwebpages.com/calculus_a_complete_course_9th_edition_adams_and_essex.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/illinois_tool_works_inc_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9929db-efb3-4c17-a111-aec90368a1de/negukogitozexezoruxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd237a21-6c75-405f-a01b-b215701b75e6/59422015978.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/entourage_drama_korea_sub_indo.pdfIn PDF document text
    • http://gofozumi.epizy.com/suluvaraletuf.pdfIn PDF document text
    • http://salulasalanegox.rf.gd/muwoforitisotenoxem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 5404 bytes
SHA-256: fdcd821459bc085e18c2c0d7b7da6e269881364209e1f852be9c383467389d7e
font_01_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 13472 bytes
SHA-256: 3c9ec40a3c6b2b9fc7bfa54b8114d96ac4a6952e12a1868e9ac5707e996bccb3
font_02_sfnt_off000157fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FB 16392 bytes
SHA-256: 7d7276cc0ae309bd4692992bdc7f0c89c386248b95cbbc915080e0668c204b06

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