Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1614fc1979d021b…

MALICIOUS

PDF

61.3 KB Created: 2020-11-16 16:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ecfe65adef7ac26750e27af799cbcf83 SHA-1: d16ccbbfa255dcfea47e4382668920c2d709b4f9 SHA-256: b1614fc1979d021bbef773649a4d766d050515194cfed12fca258347cbecb29a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=cvs+learnet+module+answers In PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/puxoburaxakapewefo.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/kinorol.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/zifejodanaxikimisago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_5fa28446a8e2b.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/desepawizizo.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/xovom-miramet-puvaz-tefot.pdfIn PDF document text
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/ludik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5fa9e08462075.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/wuniku/wahoo_swim_team_penang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd7c127-da0b-4b23-94b9-0152aafe50e1/87609431794.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_off0000a76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA76F 4980 bytes
SHA-256: 49b7b6ffd04cbebc57440d9529f18a38c500fddbb64e340cf3d1544af5dbcccb
font_01_sfnt_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 10096 bytes
SHA-256: 607fc34ecc96c483deafa8a6ba2c663d246ec549b9f59071c30a3574f6cfbc38
font_02_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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