Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da74be904bff155…

MALICIOUS

PDF

59.6 KB Created: 2020-11-11 17:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e8253e9d9880b17840bb7715eed4d8b1 SHA-1: 07fac807803cbc4b97396748deeefd6426c0bc70 SHA-256: 5da74be904bff15545c748a934ee148b25df455e6f00db69400b66de97bf538e
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to a 'manual' and the authoring application, suggesting a lure to disguise the malicious links. The presence of multiple external PDF links, some benign and some unknown, further supports a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=plantronics+m155+manual In PDF document text
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/84615fff0.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/zunaduxa/2004_honda_225_outboard_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9b9ec5-d63d-42a6-b594-6c206567446b/chapter_29_apush_key_terms.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/79483901014.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/nerepanusawejopofizovafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a0eb0a-d674-4a2d-8ff6-2c23703adb07/47867428845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0e57d9-5713-461a-8cbb-3bced6b3ccf7/adventure_time_games_break_the_worm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fae2da-20fc-48e4-acf1-8318652cc482/61469517081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fa90ff-fc79-4185-9034-050a616ad2db/juwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6c00c6-cb10-4550-92cd-25d6beb36cc6/basorike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b92625-a5e6-4670-ab4c-6dc6185beeae/7995824198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05bf9db-8eee-428d-a911-fbd7d2f9cfa0/mabitamoliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672df874-d88b-45fe-9875-2d47f0c7542c/23981003582.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_off0000ac1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1B 5124 bytes
SHA-256: c2994f3bef2a16e6a45acf131d1f5841202e8cd711abf1a0c0d64de6b1ceb476
font_01_sfnt_off0000bd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD78 10200 bytes
SHA-256: f68226351159a5c1a5dd55203759e692af2a7422451bc5dbf1f0c7118fd656c6

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