Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdec1373a82e6e7…

MALICIOUS

PDF

64.7 KB Created: 2020-11-29 20:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 82feb84860551bd050b0566a3e5aef1c SHA-1: d645bcc0229a8717ba60914eea0922eb5ecc1e16 SHA-256: 7cdec1373a82e6e7c5fc485cc775e3ed3876ed8b484801042ca5837814004972
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://traffset.ru/123?utm_term=grain+valley+fair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5fb5a779e9315.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/zamameb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_5fad33f4bbe1a.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/568536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f980e439c7b3.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/03069993f12a56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fb5724b874fe.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/xezonijida/bangladesh_train_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a098287-34c8-46b8-b2e0-fedc98983da8/64006335857.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/metonymy_in_act_3_romeo_and_juliet.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/fatemurizikox.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/costume_plot_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/lisiletatasiwajuzunufij.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9F 4776 bytes
SHA-256: 2efedb3379e8d6e447072d126acee294365588f645dff1600bace58b9b77d995
font_01_sfnt_off0000bafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFD 11412 bytes
SHA-256: fa368f47e63ac2c359ea24a78220fea85985e75c343ebe90f9a80441b5138d35
font_02_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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