Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed85ab6fa8cd4d04…

MALICIOUS

PDF

75.7 KB Created: 2021-03-13 14:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 673c8e8adae133368a5baa271e3815d1 SHA-1: 5eff4e2e26c756f3a187d1b029586104739406a7 SHA-256: ed85ab6fa8cd4d044005ddfb7702e628c290898ba352ca3dd425372efbb8fb3f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=cfa+level+1+material+pdf PDF link annotation
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/dosaded.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/skin_burning_sensation_on_lower_legs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_60175ce00e603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_601c6a6aa33a0.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/8973151.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/gejobelopas.pdfIn PDF document text
    • http://musc-media.xyz/geresuz17iiy.pdfIn PDF document text
    • https://dubigeta.weebly.com/uploads/1/3/5/3/135341625/0a7ce66b59.pdfIn PDF document text
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/b0d95fc0.pdfIn PDF document text
    • http://idealicait.site/robots_warfare_wikicv1n4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601ba5b9bf799.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/sivanira/kegivalezegiwixujadolone.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/assertive_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/what_time_does_ross_stores_open_today.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 5028 bytes
SHA-256: 30b23c14902e69a30e121653a43ca6472fb91caac91a3a05a19dec33755e1ce4
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 11364 bytes
SHA-256: 2d4ba953e3b4115852ed47c7d4a5b6f81392af4a523a942f08632c1ec9cc3d9f

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