Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f3bead0c67d0fe…

MALICIOUS

PDF

71.9 KB Created: 2021-03-13 23:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b84f735469415ded7b1ca763edda0bfc SHA-1: bed6b69fcff36a34a3883d54d0616da7dfea508f SHA-256: c2f3bead0c67d0feb702f072a3d21aadcfa1ba3c9b456eac7291d11ac76756b4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to distribute traffic or host malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=willow+springs+kennel PDF link annotation
    • http://100naturals.fun/square_enix_games_pc5kwki.pdfIn PDF document text
    • http://snt-br.ru/bibalinolpzwe.pdfIn PDF document text
    • http://batmbatm.ru/browser_opera_mini_androidoyb53.pdfIn PDF document text
    • http://lunotikipadul.66ghz.com/geologic_time_scale_worksheet_high_school.pdfIn PDF document text
    • http://fabifux.22web.org/5_dysfunctions_of_a_team_assessment_results.pdfIn PDF document text
    • http://creditpm.com/xuzupeny7coc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_2daf2876c2204373a69887937e01cfd2.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_3c88b6169ba04a54bee12968e8e3f47f.pdf?index=trueIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_2bc753b75f5343709cb18be3a533164a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee147a2-0040-437f-ae38-0d154c078bb3/what_is_not_personal_data_under_gdpr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c73d81a-abe6-46e9-873f-209dbb6c09fc/tezizalum.pdfIn PDF document text
    • http://xofisimubi.epizy.com/baby_girl_names_with_ed_in_them.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_332e90fc4e2942ff8b2e4eedf740bd19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af18384-dd11-45de-ac6e-a11a3d4b1874/night_owl_720p_dvr_reset_password.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_33be5ecd25dd4ac38e344d8fad9fa043.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64eb0b7-7021-4d5d-a5f8-92015edbfd9d/wilisulofogofes.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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 4944 bytes
SHA-256: 2a212601577bd16a0f3d68fed32ac62118b67073e5350a336e499217cce6f4f8
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 11088 bytes
SHA-256: 5ba5b0437f2756db39d87b206500ec649202dbb26e1628eefa0697a9c42edae6

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