Malicious PDF — malware analysis report

Static analysis result for SHA-256 95914fd444ad0be4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 02:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b27336b87b72e4736cb4fe74a836519e SHA-1: d48480c45a980c75f2f248496bf44afb9aa7d21a SHA-256: 95914fd444ad0be44452fc46c9c50ebe7edd9d9ea7d4eb9b3ba1d53e00afe14d
214 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a 'PDF SEO Link Farm', directing users to various external URLs. One critical heuristic indicates a 'PDF Malicious Redirector Link' pointing to 'https://yafferge.ru/wix?keyword=eco+column+lab+report', suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=eco+column+lab+report In PDF document text
    • http://digitaltoolsfor.xyz/wibuxokaxus1fvhn.pdfIn PDF document text
    • http://sis-paypal.com/bcece_le_question_paperm4xnl.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/jYijcaA/metal_slug_anthology_ps2.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/2khijfp/namodanenud.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/rjigRhi/parler_a_mon_pere_meaning_in_english.pdfIn PDF document text
    • http://cmb-eco.com/ziriponajarejwx6km.pdfIn PDF document text
    • http://trelon.fun/craftsman_25cc_weed_wacker_will_not_startslw2q.pdfIn PDF document text
    • http://1cats.space/86159026481m626j.pdfIn PDF document text
    • http://belkwigs.com/biografia_de_bill_gates_corta9b8rn.pdfIn PDF document text
    • http://jirafka.space/zoxowolomogararizewor18j9.pdfIn PDF document text
    • http://opssmall.space/168527546297b94x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bidivo/minuet_in_g_bach_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/54709503341.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_e76f74eed7ff4fd69e878960aba9dce5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/40398612536.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_8330c0262b9b4446a7314515f0586fe3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/ratinutetagone.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_5ee3412766c14e49ab767315a7be728e.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_e4dfd33bb9f245f68106c42f380b255e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/66140355980.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 4832 bytes
SHA-256: 57a0372e6939537df227639537f411f055abb905d6ad1638a197500fc7f81a7d
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 9964 bytes
SHA-256: bcd7b0d925f5414c132c8daf6511fd4f41e51fd5bf26a479293eb94b3c98587c
font_02_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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