Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b46115ae47cfad…

MALICIOUS

PDF

75.8 KB Created: 2021-04-26 17:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 29f9046a722e4e1bda6a338c85ec37f1 SHA-1: bdd80c43fdac29519dfeea6ef54766e5b61ad4d7 SHA-256: 73b46115ae47cfadebb67c59e3fe7c749c16ebc1f263eeee3c955253b1bc32a5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=army+civilian+to+military+rank+equivalent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452392/normal_6043bc00c609f.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/d27295e0a736de6.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/ieQjgKy/bird_screaming_outside_at_night.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ididoHP/axes._io_hack_appvn.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/jdgcZRB/black_christmas_1974_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/C2DoLgd/kunutu.pdfIn PDF document text
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/dototusolu-dufeveribisusox-dotugisiduko.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/7952627.pdfIn PDF document text
    • http://tubipiguposazi.22web.org/fojamitud.pdfIn PDF document text
    • http://kiluniv.22web.org/68356093477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5feaf61788ba9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_e66fe711b2fd4f85b39dd2a656390e8d.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_77e888bb61424a5288d9d1c509de4828.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_a38f1cc6a0784dcdaeea91c0973ac348.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_05e5696bfce04fe5bfb19c21b7be2abd.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_4a1bb3b39bb84e228b22ba7905746aaa.pdf?index=trueIn PDF document text
    • http://netupizorazez.rf.gd/nenu_local_arere_yekkada_female_song.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_2f4d6242c7524d8aabf9d9caf2a2f40f.pdf?index=trueIn 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 5108 bytes
SHA-256: bebf1a8978a0534e36b2eef84ac5448d221fffc65658ed891b2cdec2c15b208a
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10736 bytes
SHA-256: 3d8848c339965fa4184d6000bb1b971764b17501fc254446a0c0a02b2ef17da8

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