Malicious PDF — malware analysis report

Static analysis result for SHA-256 115cf7715bf3567e…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 04:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4d1d51eff8f41248a632f45150b6011f SHA-1: b1f5f121b07a1a01a9bea77da8d6d7bf5136676c SHA-256: 115cf7715bf3567e9071e9ea64c0b9f5dce43f49b09eb4a0e1b6074ee8aa2582
186 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 0.9996

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://garglob.ru/pbw?utm_term=new+sensations+videos PDF link annotation
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/18e33ed017.pdfIn PDF document text
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/186973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_6063a75c9764d.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/jonixe.pdfIn PDF document text
    • https://xiwotedusogatif.weebly.com/uploads/1/3/0/7/130775269/gokefujafa.pdfIn PDF document text
    • https://javogukurajukip.weebly.com/uploads/1/3/4/2/134235542/6002605.pdfIn PDF document text
    • https://depovazopalixu.weebly.com/uploads/1/3/2/6/132681382/6512640.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/nipiled_doxijotilesos.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/8ac1a242828c87.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/jexoxexig-zabad-vivezuridozidur.pdfIn PDF document text
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/9e72f533b0e0.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/xijavigimizizorepaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_60be88a696959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_5fd9f44f83432.pdfIn PDF document text
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/kumaremag.pdfIn PDF document text
    • https://betogazubi.weebly.com/uploads/1/3/4/7/134768910/0c8026d.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/03f938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwuromo.pbworks.com/f/fepepatisi.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144874047/87482883489.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/w/file/fetch/144675270/femijosupo.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/w/file/fetch/144632757/zebesuwurabi.pdfIn PDF document text
    • http://mugobug.pbworks.com/w/file/fetch/144945177/30_kbps_to_mbps.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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 4812 bytes
SHA-256: 435c4b0eb805bbb47ef4e230fe8246017189079312d6f47d1eb14ab2417a6f1a
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10096 bytes
SHA-256: bec60baeaec9345ccbbeae0bebb51dabaa7f7d3d31c4c00e94cddd9363c6f2d2

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