Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd261606cb628f7…

MALICIOUS

PDF

77.5 KB Created: 2021-05-26 21:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64fe014c1d11acf9251b3c4a57500f3f SHA-1: 5c9cf4bc33d30763db2decf8a7b03449d0c96826 SHA-256: 6dd261606cb628f73890ae38d45835d460e033a80d2e04d5fbce306eb49e74f3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, likely to manipulate search engine results or host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn-cms.f-static.net/uploads/4486201/normal_6057dd6852615.pdf
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/baxixid_vaxaxabedudoji_bigoburetixaji_pigenisaz.pdf
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/tefafulumi.pdf
    • https://fifosekula.weebly.com/uploads/1/3/4/0/134041306/e37bd61654.pdf
    • https://cdn-cms.f-static.net/uploads/4480743/normal_6015109809abe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=bengali%20to%20english%20dictionary
    • https://uploads.strikinglycdn.com/files/1702788d-8b07-4905-8a23-ce8e99dd995f/listen_to_agatha_christie_stories_online_free.pdf
    • https://uploads.strikinglycdn.com/files/1d9df013-6c36-4ad6-b255-ec45e8ce14f1/what_does_the_title_the_fire_next_time_mean.pdf
    • https://uploads.strikinglycdn.com/files/2f81d31a-b13b-44e1-ad96-941f170db869/how_to_start_tux_paint_in_computer.pdf
    • https://uploads.strikinglycdn.com/files/d9665391-4cb4-4680-9807-ba451a85a199/74539480375.pdf
    • https://uploads.strikinglycdn.com/files/1a4eab56-4698-454f-8e3d-c7364406b2e9/emt_med_math_practice.pdf
    • https://uploads.strikinglycdn.com/files/8380f168-9bec-4e2b-ab26-244695e1d890/what_does_4_22_mean_spiritually.pdf
    • https://uploads.strikinglycdn.com/files/e9e89d3e-130b-4bec-8432-764a83b5f058/xidokok.pdf
    • https://uploads.strikinglycdn.com/files/e341e5d1-207c-4507-a3f7-8ab0fa56c2fc/23385275062.pdf
    • https://uploads.strikinglycdn.com/files/cbe6d065-da59-4200-a5d4-4d44e7cfbfb5/nugaxajoterolidu.pdf
    • https://uploads.strikinglycdn.com/files/dd35b0e1-3e14-4743-a3fd-fbecdce48212/diana_her_true_story_in_her_own_words_free_download.pdf
    • https://uploads.strikinglycdn.com/files/de197f2e-2e6e-42fd-93e5-28da1d1484ee/where_is_the_water_filter_reset_button_on_samsung_fridge.pdf
    • https://uploads.strikinglycdn.com/files/d7b713d4-cca9-449d-8779-afdb1a98c017/mudinizelipomi.pdf
    • https://uploads.strikinglycdn.com/files/ec989e02-fa73-42ca-8906-f484e73f363e/alpha-phonics_a_primer_for_beginning_readers.pdf
    • https://uploads.strikinglycdn.com/files/47d4151b-f904-49eb-b261-665ef7c36909/jesidaritolano.pdf
    • https://uploads.strikinglycdn.com/files/de7d90fc-9a67-4c8b-b9f7-28c0b398952a/the_art_of_racing_in_the_rain_book_quotes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f252.bin
e3b47a4b55235895f37302b058b1cb64bb371124025bd4568d087220ac450d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 5352 bytes
font_01_sfnt_off0001048a.bin
cf98ea5f81ed60ca59bf7cdad431ca6ad97f3517ddab39ee7ac63e984ef7c799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10568 bytes

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