Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5ac261cda4099d…

MALICIOUS

PDF

86.2 KB Created: 2021-04-05 05:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 21b7adbc5018d95c27d96017fac455bf SHA-1: 7f375d582d0dc428c4e15ed61886f2996dc48e31 SHA-256: 4d5ac261cda4099de7f6384a19c5dab7ec24119e03919da224b69f9f4d20b466
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which appear to be part of an SEO link farm designed to lure unsuspecting users. The primary redirector URL, https://maypoin.ru/strik, is associated with a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=functions+of+school+social+workers PDF link annotation
    • https://cdn.sqhk.co/modonasuje/3ghZifr/never_have_i_ever_series_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/cBEjdhd/8745304267.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/o1val3S/34119052578.pdfIn PDF document text
    • http://unlockdeals.shop/worksheets_division_word_problems_grade_3smnx4.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/shgvEif/gajur.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/study_island_answers_math_7th_gradell8mn.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/kis_kisko_pyaar_karu_full_movie_download_mp4nmpdi.pdfIn PDF document text
    • http://itrom.fun/wuwokajaxitapadevugukefw2ctp.pdfIn PDF document text
    • http://reduslim-europa.site/gifuxigikidaxiwu3cc0e.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/pibajuwi/daruluxosonozewitu.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/19403900552.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_3161513655114061bddf4f5f3a0cea9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firudegix/xivekagabukofubitox.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_840f833813af4c7f839334fd6b4d043d.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_ec1ec414487644a8a2d8bb20275c7e64.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_adac5f0f100b471eb47bcfe7412dbda4.pdf?index=trueIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_fcff57efcbc04545963c277f9ada6f01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/cheat_engine_6._4_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/50141667579.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_6b2ddfa70e6d4607bc10e9f79bdd03ce.pdf?index=trueIn 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_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 5080 bytes
SHA-256: df5643ee44f3f6a35528a4dc37420762fa93e87d07cc4453cab99b2e38d28a30
font_01_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 10592 bytes
SHA-256: bc84396d80a35630b13e297ab6459ed3298a4da88d142964d74469e42ad3b29e

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