Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef82e7704381f840…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 14:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44b9089a8b6249096d2cd2db1f554062 SHA-1: 9e03d004099818937bcf985522c5dbd0378eb714 SHA-256: ef82e7704381f84006791ce4d0df7c3f7be9dcf9d95796cba4e0543abd8c04a8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://jacksth.ru/wix?keyword=measuring+mass+worksheet+grade+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5ff1737f194c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5fef7743ad684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc807ac4f8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5fca0ac3d8d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_6038249145b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_602b714ba6712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5feff4a5574b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_60484a0e529c5.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/fasudikek/antivirus_app_2018_apk.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_2037429d2ca34cfe8911c226281c26f5.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_bc199235b51d4266870a99a05d20eba6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/17772348505.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/cabral_industrial_organization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934a9114-d017-4eac-9b1a-5bda6733aedb/juvadutenol.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/kawasaki_bayou_250_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/52986343198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62504d19-68ad-47c9-8fdf-ef67f5232099/84493088081.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/mosaduxuj.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 5492 bytes
SHA-256: e4976efe7bfccf21dd6eff2113417ada8f6c7011b4b2fd21ecfdb8ce1b1f2675
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 10640 bytes
SHA-256: febfb1b031b29847d8835165a6ce5d88fedf91583f334c495573b7ebfe0fe1e4

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