Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab9240d6d532f39…

MALICIOUS

PDF

81.8 KB Created: 2021-02-17 06:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 35555f6f8e8727cb5fc0bbc425038892 SHA-1: 5b28b85882a310d638aea67c72e04329dcbed68e SHA-256: 7ab9240d6d532f39abe7291b1b5e17b2cfd7a5dc239e72a1a0381ab145a93fe1
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain a lure related to book pages, likely to entice users to click the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=how+many+pages+are+in+keeper+of+the+lost+cities+everblaze In PDF document text
    • https://cdn.sqhk.co/vitozogog/dhie4jd/83605521802.pdfIn PDF document text
    • https://fubuworarakej.weebly.com/uploads/1/3/4/1/134108970/lutiget.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/kuzodezube.pdfIn PDF document text
    • http://begetus11ppz.xyz/what_are_the_different_types_of_process_models8appb.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/e8fbc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_601e13a12e6be.pdfIn PDF document text
    • http://razvivatel.blog/chemical_vs_physical_change_worksheetlx4bs.pdfIn PDF document text
    • http://afracheat2.xyz/58396079379nt40a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5feaebf0ea54c.pdfIn PDF document text
    • http://banque-populaire.best/stunt_double_school_los_angelespltzi.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/b414a.pdfIn PDF document text
    • http://tudilaxug.22web.org/sol_du_marksheet_2018_ba_programme.pdfIn PDF document text
    • http://zatoboyvibor.fun/armored_warfare_tank_guide23gv2.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/biiJdic/dragons_rise_of_berk_cheats_no_download.pdfIn PDF document text
    • http://obschee.xyz/40323582436gya39.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/32243066773.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/tsiiYLy/mlb_shop_yankees_jersey.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/SR4Yih8/resizuzatuj.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/where_is_the_filter_on_my_samsung_top_loader_washing_machineb23ri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palalujopaxuv.epizy.com/good_food_guide_awards_2019.pdfIn PDF document text
    • http://visowad.epizy.com/lotusebimejeluna.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_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 5900 bytes
SHA-256: 1240c6dbdaf78ff0311230d6148dc4649f3167548b28ecb65b78e441efc4074f
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 10904 bytes
SHA-256: 89518208fa055af84c4f82dadc10d3fafb40b326793ab02aeb51aa9685c578e9

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