Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ff6ef38ccb4803…

MALICIOUS

PDF

77.1 KB Created: 2021-04-30 00:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 355b43d4f59b9f529ac60b1d46056628 SHA-1: d498542410179b2bc62bcab55ab1e9b2668a9969 SHA-256: 26ff6ef38ccb4803256552fb371e1a5993e1f603b5b379a30181b29b355157db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://midufefew.ru/strik?utm_term=programmable+logic+controller+plc+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6066aa0c9a913.pdfIn PDF document text
    • http://merovew.xyz/96381972226r6x1q.pdfIn PDF document text
    • https://figokafudifugi.weebly.com/uploads/1/3/1/3/131383964/nukajuw-voxilodavij.pdfIn PDF document text
    • http://kogegoleteneka.iblogger.org/xubikujejekej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_606b62fc25a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_602a9b8c03b41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5ff1f20b0c759.pdfIn PDF document text
    • http://mosquito.codes/pukewetamonok5u0yl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5fddfb60492e4.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/a976e08221d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozazidugo.epizy.com/sales_assistant_cv.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/97853808568.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/nudanivediv.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/62029535612.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/diseases_caused_by_gram_positive_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/wevipigopovipavakamile.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/mini_dvi_port_image.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/9242751426.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/abcd_3_songs_ming.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/76188508471.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_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 5440 bytes
SHA-256: b3dc02b967185c6ca4e13fe2bce0278c8184dd4024d48c279fd23585d190d316
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10616 bytes
SHA-256: a6a7ffe9fda148683bad613d666d747d308eb90d0586d9d3d4bc37f329429adb

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