Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7940a96423229d0…

MALICIOUS

PDF

132.7 KB Created: 2021-03-25 16:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: df7485356c72f357c31a8dfbc38c2209 SHA-1: 5b21bb9e4c6992de4e4b7acb22f8bdddea27c078 SHA-256: b7940a96423229d005451c067d3bf6b4392c2fdbf7ec6207547eb3ee62898062
226 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. It uses a password-protected-archive lure. 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 0.9995

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xajibur.ru/123?utm_term=harvard+referencing+guide+uk PDF link annotation
    • https://cdn.sqhk.co/podizapexiv/geMkajf/niwixinu.pdfIn PDF document text
    • http://milktree.store/how_to_change_battery_in_moto_g_2nd_generationk907t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_603e0e7e1f0c2.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/ifdjgPA/cross_stitch_kits.pdfIn PDF document text
    • http://bestrongbyg.com/absolute_value_transformationsb0lpb.pdfIn PDF document text
    • http://levantemosaic.com/dimosakasagefuri3n1wd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_600c7636316aa.pdfIn PDF document text
    • http://pawelemofub.iblogger.org/solution_annealing_stainless_steel.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/igepVii/lelaferedidi.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/diRthmS/213893496.pdfIn PDF document text
    • https://cdn.sqhk.co/norasoketika/BjgqUhf/game_tester_resume_format.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/jFw6AI3/rowexuguvegoka.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/e7s3KcU/prank_call_numbers_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fd3dc3568d08.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/hajj7ie/yellow_wallpaper_iphone_hd.pdfIn PDF document text
    • http://insta-sale.site/245703147310axj4.pdfIn PDF document text
    • http://rapejavom.22web.org/descargar_badland_apk_full_mega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_b3e368c19e9749748886c07f77addd51.pdf?index=trueIn PDF document text
    • http://vemilumawulab.epizy.com/beehive_class_9_ncert.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_1f6fa8e3f05d4782815fac73a075a763.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_324617d2a08d456289186be829073818.pdf?index=trueIn PDF document text
    • http://kurejaj.epizy.com/changa_one_font_free.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_off0001cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB41 5064 bytes
SHA-256: 7ffb286d5b4f29fe52d4d4a9aeb84df647497991bc3562e7d8f234de13fb5d2f
font_01_sfnt_off0001dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC9E 11784 bytes
SHA-256: 4c37cc6f6fde11c4dc6e367e8885b4729112fd1c029e03e53bd8ca1c2eb43d1c

Open this report in the interactive analyzer, or submit your own file for analysis.