Malicious PDF — malware analysis report

Static analysis result for SHA-256 de25be3888979a9f…

MALICIOUS

PDF

85.4 KB Created: 2021-03-18 15:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 56d0ee6e19accfeeddceb75a675ed737 SHA-1: 9502fcada8eb530bb100e1d55f8bf4da5df0d1a0 SHA-256: de25be3888979a9f67be0fced13930a933b945c7beef6eb29530d8fe4896c8b8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests a potential for redirection to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=swift+creek+elementary+school+phone+number PDF link annotation
    • http://zuvels.xyz/voxajigesabukagupapia9718.pdfIn PDF document text
    • http://axacheat4.xyz/84722260764e26o9.pdfIn PDF document text
    • http://dfwshootersupply.com/gejerabepanotaf4sthv.pdfIn PDF document text
    • http://everydayy.fun/685389013147n815.pdfIn PDF document text
    • http://vatamuvemazaril.sportsontheweb.net/brunnstrom_s_clinical_kinesiology_6th_edition_download_free.pdfIn PDF document text
    • http://retamos.mygamesonline.org/15816383804.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/remstar_pro_setup.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/cuadro_comparativo_de_escuelas_psicologicas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_ab3a5719ebd044abb3ee4a6efccb42be.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_9de8c3e373e64cebb488172541d7464e.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_f4c4963464d44c10a9e91bf96ecfc65e.pdf?index=trueIn PDF document text
    • http://momedeturus.epizy.com/fifinelosif.pdfIn PDF document text
    • http://jomexikosuzujis.rf.gd/6667219901.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e591aa1d53604f4e958215b45511a9f1.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_7b80b6c07ac24cf29daab3971e12cc83.pdf?index=trueIn PDF document text
    • http://gamojeliziri.rf.gd/kailanan_ng_pangngalan_worksheet_grade_5.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_478afbb6935e4b3d812d1f7eec606cef.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_509cb06ef86a40b6a1fda139b4e1a866.pdf?index=trueIn PDF document text
    • http://weromewu.rf.gd/abordagens_pedaggicas.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_d305c5fa90e44e4fb801f5eccd8aa20b.pdf?index=trueIn PDF document text
    • http://jawegoxizifiti.epizy.com/home_lease_purchase_agreement_template.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_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 5756 bytes
SHA-256: 7b1d7b9e39d8526c1e4898c7e8663e70ef2baf8faf305193fbec0ae4a828f98b
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 2344 bytes
SHA-256: 55e88c758970e09ee7811c883eec02e6f475f7974f2f91f3957056ad2301e7cc
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 11316 bytes
SHA-256: 680d979e67c511d6fc074957203d4194e20189877ee75b40598ebe0e93fd0de0