Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a734ada2c857ee…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 09:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cef048000501c4125a9f5c3e1ae42310 SHA-1: 953df2a4383e19a19bcd3ab64a01ab0d0a00f983 SHA-256: 25a734ada2c857ee98d32226fb085369a50b676f553592af4fe9b95dfdbd12dc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, https://xezojetit.ru/strik?utm_term=clasificacion+de+las+cuentas+pdf, suggests a potential SEO manipulation or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious with high confidence. No scripts were extracted, but the structure and URL distribution indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=clasificacion+de+las+cuentas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367911/normal_6046350acb109.pdfIn PDF document text
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/577c524c3adafd.pdfIn PDF document text
    • https://katidifivova.weebly.com/uploads/1/3/4/7/134715674/05e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_6037e00376a71.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/piluruzojudesososed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ffc631fa5b70.pdfIn PDF document text
    • http://riluturuka.22web.org/amadeus_manuel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_6052dfe525cdb.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/lanabidiwebinib_tewap_pafewu_sefaxok.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/d06ef1c3-060b-48c9-8980-cd07857aa1a7/big_data_analytics_in_bioinformatics_and_healthcare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9711543d-0bb5-4b55-8b2d-7f6992aee88e/sivipunuwodowen.pdfIn PDF document text
    • http://kazaxese.epizy.com/jovomizijevexe.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_ab277bfb0ba2482c8dc08f06dac1e2ba.pdf?index=trueIn PDF document text
    • http://fetafuxukijixex.rf.gd/badnam_full_hd_video_song_1080p.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_d1fe6c732d10496fb715017703ae434a.pdf?index=trueIn PDF document text
    • http://gozipoxux.rf.gd/todajebidarajup.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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 4960 bytes
SHA-256: 86da325ccb834c13413d17a57f4d12c301bc8ab38e1f2c53da649f10899ff6f5
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 11596 bytes
SHA-256: b642820a10175cbea5f77100f78a84c78001efb6cc549c0ae78f5595999fe6f4

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