Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8ebeb66f288b9b…

MALICIOUS

PDF

72.3 KB Created: 2020-12-24 19:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 40115dc7608151e841350936f8b86051 SHA-1: e6cc0906674be0540a4355fde1dfb35b88804a25 SHA-256: 5c8ebeb66f288b9b94d3751f65994dbc86f89b54c9a013c36cb7b26d79379529
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'betclic casino apk' in one of the URLs suggests a lure for potentially unwanted applications or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=betclic+casino+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448538/normal_5fbc34e9b9e8c.pdfIn PDF document text
    • https://mudomuroda.weebly.com/uploads/1/3/4/7/134728654/7221686.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/jotafe.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/f1900381605a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_5fd12c6fdb26a.pdfIn PDF document text
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/koluxanukujo-lalekuxu-jowikewo.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/5806827.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/90c764158952ad7.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/bizuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f94d9e19295d.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/fokafubamasileloke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5f9cd90a25a1d.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/bef7d2b3-c6c0-4a8b-8307-6f473ff4d70f/1995_ford_mustang_gt_5.0_firing_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcca865-7ea4-4aee-82e1-b7e251924445/navazal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413ebe22-316a-472c-b4d7-8c743511234a/wepopitofegana.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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 4944 bytes
SHA-256: 0ae68a1bd3509301003b87ef84255a8bbdeddd5fa383a40f18fb609306487637
font_01_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 12492 bytes
SHA-256: b8858de190ea048dab2a9653716ac20f8a00f6a9d60e5335d4bd49057c8989da

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