Malicious PDF — malware analysis report

Static analysis result for SHA-256 1596dbf8aee692fa…

MALICIOUS

PDF

78.5 KB Created: 2020-12-17 09:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b2891f9440882b5e3778173aa2b46b27 SHA-1: 330a4801d0077b8d1864ed85e8f36b60cc433f61 SHA-256: 1596dbf8aee692fa477bde315f92ba1536fcc73be8aa15e4e7db5f29aa448fc3
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 0.9997

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://trafffe.ru/123?utm_term=viktor+shklovsky+theory+of+defamiliarization PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fac02bd15976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5f9659242c934.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/digabet-genike.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/wolomaputawevawotup.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/jarijiwavev-vewugofededat-dotato.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/bowadajedu_xewewiraxuvuna_japejaxege_sotadap.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/jumuvoxarima.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/juzowilipi/define_purified_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfcd6f403f5353fd8f68b6/t/5fc127353485235c86f00359/1606494008294/rca_tablet_rct6973w43_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c69c88c99b6d37b36994/t/5fc9962655485c3109ab0164/1607046697209/zosonuxebenujasewevisome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f853902a-63ec-419e-9987-c0d7f96276b3/fivigunisupesekelereban.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce72ec252249592b5651f7/t/5fd71f6fd654060362e0f721/1607933809897/basara_ppsspp_rar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511d8c02-095a-43de-a006-0f73d21665bc/98596637708.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_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 5388 bytes
SHA-256: 5951ed2a1266ca63832f575da4cb6b65db55059539d1964fc8123b2eaee5662d
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 12136 bytes
SHA-256: db909a2f4fdf9917e1832dde86bd4c8b81b0a2c9d27ec647f9bfc8b10f42c3d7

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