Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d667f744238a3a9…

MALICIOUS

PDF

79.2 KB Created: 2021-04-05 16:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 590b9e7556d76b23eee2875eadc6d4c7 SHA-1: 276ac30cbfb961c3bf529304cf4da8daa211f3fc SHA-256: 3d667f744238a3a9b1f3b9b4d673108ae9f6c51cf843d0346f9dd1529a76ac8e
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=the+clear+quran+with+arabic+text+pdf PDF link annotation
    • http://studyweb.site/ortaokul_matematik_olimpiyatlar_sornelkb.pdfIn PDF document text
    • http://dugules.iblogger.org/i_will_alison_krauss_sheet_music.pdfIn PDF document text
    • http://lejebodaz.22web.org/amharic_english_dictionary_kane.pdfIn PDF document text
    • http://zoomita.fun/how_to_increase_render_distance_in_minecraftx3xq1.pdfIn PDF document text
    • http://razetinebi.22web.org/98776363967.pdfIn PDF document text
    • http://numitoredewatam.iblogger.org/giwanadapisulosaluvirimid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26e4666-e78c-47ba-8546-a869ddb0e327/51412110995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b288a0-284f-4cbc-9c38-b14f1cb80bea/91947201552.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_0306de253c084a3b94065bb095cbd520.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_0f1d7ca4ec5b46929dec23d71b2ef46b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/75123244396.pdfIn PDF document text
    • http://marabawem.rf.gd/berocca_performance_watson.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/shooting_games_free_highly_compressed.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_db59169ccc0143b2a5eaed05e6508d33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ef1cb9-7ab6-4bbc-af2b-6044f6991a53/does_jack_die_in_when_calls_the_heart.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/arslan_senki_s2_sub_indo_batch.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/73575254882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d0eefa-f907-4f43-9da0-ee3f3f9584b7/what_if_my_checks_printed_in_reverse_order_quickbooks.pdfIn PDF document text
    • http://depegiwisa.epizy.com/how_to_use_garmin_delta_xc_series.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/zifapitafeginikoluvijoz.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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 5440 bytes
SHA-256: 800d61933914e2cadcd34a834b61bfac0e2f7627398114126460a77abab0b8af
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 11644 bytes
SHA-256: a67cf23b868b962c74f47d09f39454859d322175218543a465061cfc797c5c9d

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