Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a95e1700497a62…

MALICIOUS

PDF

75.4 KB Created: 2021-03-04 15:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d993a77ca21c085e2f1c6cef25294071 SHA-1: d273ce69bdf4fc5e6eb8dae38350d796510cbf98 SHA-256: 15a95e1700497a62592ece06dc8137a8fa47bb2d06d86be877fc34877894c205
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://kuzutuzo.ru/123?utm_term=brownie+robotics+badge+pdf
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/zawimat_xazerolafev.pdf
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ff70ca488bc6.pdf
    • https://cdn-cms.f-static.net/uploads/4388426/normal_6025c66417c45.pdf
    • http://xuxijosut.sportsontheweb.net/philips_voice_tracer_audio_recorder_6010_review.pdf
    • http://kamikofonem.mygamesonline.org/43226274263.pdf
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/6430368.pdf
    • http://rasidafepu.mypressonline.com/pipixazobemepakodovuwob.pdf
    • https://cdn-cms.f-static.net/uploads/4408583/normal_6021d319bdebc.pdf
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/135806.pdf
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/vasaji.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_603a2c78d769b.pdf
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/pufevipoz.pdf
    • http://ripelavezomosiv.iblogger.org/8203475507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21cf27c1-cb1a-4a22-a5cc-7c76f4f7d6c3/61268801509.pdf
    • https://uploads.strikinglycdn.com/files/e5f7ae55-ee4d-4190-9fb0-14296368cc6d/28270574309.pdf
    • http://vovugezufined.epizy.com/28612800962.pdf
    • https://s3.amazonaws.com/ragejufa/54317297435.pdf
    • https://s3.amazonaws.com/tanapilamaxi/79211458862.pdf
    • http://muvalinifotu.rf.gd/baal_veer_ka_picture_video.pdf
    • http://mimumugemefes.epizy.com/what_was_rivers_of_blood_speech_about.pdf
    • http://birofasadonu.epizy.com/muvapogakaxovevin.pdf
    • https://s3.amazonaws.com/zonivezada/63932897256.pdf
    • https://s3.amazonaws.com/xotomisen/ncert_maths_textbook_for_class_12.pdf
    • https://uploads.strikinglycdn.com/files/a0c7b942-dd6a-4a82-af98-a793f409bc2a/volafolirigo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e899.bin
36fcaf4fdac92c3d63cafe8105662a041dc93ade995056fb94873632858be071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5572 bytes
font_01_sfnt_off0000fbb1.bin
8a3a15d5508439b2f11bf3cf826fb468ba2e592d16d2302aa93a0812289a2d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10548 bytes

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