Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb05bed6f1eff0b…

MALICIOUS

PDF

78.4 KB Created: 2021-05-20 18:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5f06fc8d5d9aea9b727e600f1171626 SHA-1: ca25dd7c345f8fb71642ffdf7a146ef99fd496f8 SHA-256: afb05bed6f1eff0bc22812039368e65e67567fc70737cff23f409a20a35cc947
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious activity, likely leading to further compromise or information theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=la+lengua+de+las+mariposas+title+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369930/normal_6052b72e474a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_60394f701a131.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/ec6f6cf13d54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_606accb4a6075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_602f576e5db5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_605acf49b8496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_605ee5f2a0d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_604629fdd826b.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/mofuruv-rebufuzorokabu-wejekigil-tomexizerofovet.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/lutiwiv.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/de46470.pdfIn PDF document text
    • https://dupazenulejafu.weebly.com/uploads/1/3/4/3/134331878/6048317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_5fdc27855dc89.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/029e7c41-2fb9-4478-a295-6744299d273a/98920652921.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/defying_gravity_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1facf19-08ec-40e8-9ea6-e6db96b76ba5/5080904269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef79aa3e-995c-4284-8c9a-148af7e88369/50928391633.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/factors_contributing_to_successful_technological_innovation.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/apache_ant_linux_rpm.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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 5220 bytes
SHA-256: 3c1bc3722875c05f5ae527d127b8d2e33429280a4bbc76332bb3de6b06010dbe
font_01_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 11644 bytes
SHA-256: ecde15eeeb949f6e96c69fc1c573bb247617b16f9d1c79df4684036d3da1d10c

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