Malicious PDF — malware analysis report

Static analysis result for SHA-256 804804ee5238ef68…

MALICIOUS

PDF

61.3 KB Created: 2020-12-18 02:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a868e39f22f145d7086544b4f1d0a375 SHA-1: 255bc013403279adf7b4123838ff52a68cccb57f SHA-256: 804804ee5238ef68351e2f37227e36ef5e56ef4cec8fc5f0766689f1ae04565a
214 Risk Score

Malware Insights

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

The file is a PDF containing embedded links, one of which points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links suggests a link farm or phishing attempt, aiming to lure users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=2019+calendar+2020+template In PDF document text
    • https://jexumaravoza.weebly.com/uploads/1/3/4/2/134265375/23748113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fb7e1922b60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f89389417baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5fa0728de2ca7.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/31ca3eab-abc0-4bc4-b664-9f6db466d8f2/nowutitu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54deebd14ff0dd2b9c4c0/t/5fd1fb747c12252903f885bb/1607596916756/roman_army_ancient_history.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbceeef1491241adc443a46/1606217455045/susetudipofatumubuvefagox.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b5119849b27a00a8296b/t/5fcba76611c29807e6dda7d5/1607182183245/90s_music_movie_trivia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0341e582-5d54-4d2d-9119-cb954db06c1f/lojapemuzijobujura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b264421-0a79-450a-8a53-e9d84fcc2761/benev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6806ca3bf4b14abcfadcf/t/5fc8ab12e21c7c679ae93c05/1606986516378/children_s_prince_dressing_up_outfit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b30a10a-6e89-4ba7-a33b-71bbc376b652/finding_and_funding_great_deals.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10b71bdb33045eec31c8e/t/5fc39fd33c02f22b9d7c2bc7/1606655958882/xfinity_hd_channels_no_sound.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_off0000b573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 5428 bytes
SHA-256: 8537bd52b0f5f89768fe96c13097f5fac0a6146d257f223c3dd5be65f9d3b930
font_01_sfnt_off0000c7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CD 9684 bytes
SHA-256: 3a6bc780ce9aa474feb83d84f59b309cee5c5d90343f754e24b451fea30ebfba

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