Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1928863a36e731…

MALICIOUS

PDF

75.9 KB Created: 2021-03-31 20:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2cb3752d7533f93da8fa4ec546f7069a SHA-1: 159ea8c21de94e8483963dcd757e5e7efd0f32ef SHA-256: 5e1928863a36e7311abf683d8dba699eb963f42e87613bd8da1359f6d36d242e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=2001+chevy+impala+repair+manual+free PDF link annotation
    • http://dejepuzalew.mygamesonline.org/autodesk_sketchbook_mobile_tutorial.pdfIn PDF document text
    • http://babbieshop.ru/how_to_learn_to_use_salesforceec51h.pdfIn PDF document text
    • http://healthit.space/jarvis_physical_examination_and_health_assessment_downloadprbuc.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/letetobaxov_melokupegat.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/85616036654.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/sinivuki.pdfIn PDF document text
    • http://getcabinets.xyz/asmaul_husna_adalah_nama-nama_baikbczii.pdfIn PDF document text
    • http://lady-bug.club/6420952197n5b7c.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/1665a8cc8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/wazomikigene.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_5892eca0348c48b0a9b1ff434062fd2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/34408861671.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_5f78b85f98634696b06d0942e07a0adb.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_f989114c28e54cb09f0ac2cf4c70ac04.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_51c84527f3e84f929c5308bec0e07246.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_270b0af86c9e41b6ab173f3cca1b90c9.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_1acc005d81f24237b5a58951e45a0c53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dadupawo/nerazoxamunikasupezoruxi.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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5472 bytes
SHA-256: cc6f51b9b39fadaacdf331d46365891bcd2527bf6ec35a4b9edbb30e181a4bbc
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10660 bytes
SHA-256: 25c9ca67b4b0fe8dc69de953122037c2073c3c8d251f20da745655ae32c5a876

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