Malicious PDF — malware analysis report

Static analysis result for SHA-256 0738edbd9d100fb4…

MALICIOUS

PDF

88.4 KB Created: 2021-06-01 20:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e312ffef26d3538ed14c5b738fe236fe SHA-1: e548a0dfdf78995a54ca1f7908c857e38b8650dd SHA-256: 0738edbd9d100fb4dd3aad6f2247db21861ecb73169de49b3b1b46a5bca228ea
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=why+did+the+chicken+cross+the+road+philosophy PDF link annotation
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/refofape.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/pebava_lezabivapakowi.pdfIn PDF document text
    • https://lezigumaluneluw.weebly.com/uploads/1/3/1/4/131454696/6cd3482f8d13.pdfIn PDF document text
    • https://bivupexas.weebly.com/uploads/1/3/1/4/131453521/wupomidoxa.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/8c8ebc96f1d7be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_6041a623d2bd8.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/229682.pdfIn PDF document text
    • https://zodukoweferu.weebly.com/uploads/1/3/1/0/131069906/medidepisa_sudovugovopi_nagikadibib.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/1269056.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/805e82f3c0b2f.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/petorekosudepojojav.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/036d78a9e4b79.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/gasipipuzazu-pivaxiloneb.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/2a14f.pdfIn PDF document text
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/vavuleta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5ffa1af3298a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5ff62fd1be80c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_60070026e2c5b.pdfIn PDF document text
    • https://jexadafiveti.weebly.com/uploads/1/3/4/7/134765621/f2034f5f993a59.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/f808f73c-ae2e-4acb-bc14-8b98b5f0ec4a/principios_de_la_economia_social_de_mercado_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fdb362-a950-4ea7-9e49-6a14e690d3a6/schwinn_meridian_trike_parts_rear_housing_axle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbab69f-75ff-4a16-b561-296e482eb0a9/12239260806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d849a7d1-22cf-4dd6-8523-37fa68d2c26a/what_is_the_difference_between_realism_and_naturalism_in_theatre.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_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 5340 bytes
SHA-256: 0e66b16b11aa5b5c9db49b84615376261a2bfc7cf8af6a2b48241568de6532ab
font_01_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 10896 bytes
SHA-256: 5b995dc8e9a4209d6e45f5a678b9f9b24f7cae8a1e8f2541c37fd4f26bb1982e