Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05b847ec2bfc7ab…

MALICIOUS

PDF

73.9 KB Created: 2021-03-03 16:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 671001a9c0a88f2913de6dd3dc286624 SHA-1: 08eff1f9e382edcd6eb711eb51c832be61a2d909 SHA-256: b05b847ec2bfc7abdff13180d13b81dcd5059dcd642f7b77daa3672c95ff2bf1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://crophysi.ru/strik?utm_term=words+to+describe+a+sunny+beach', is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL distribution point to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=words+to+describe+a+sunny+beach PDF link annotation
    • http://vumajufeboxidik.mywebcommunity.org/todas_as_parbolas_de_jesus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_60195399bab15.pdfIn PDF document text
    • http://findattime.com/dewalt_20v_sds_hammer_drill_home_depotseehc.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/GgfDPND/ski_safari_unblocked_6969.pdfIn PDF document text
    • http://sosed.market/31546096971we4sn.pdfIn PDF document text
    • http://drenajkrasnodar.ru/66649348153udq28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451353/normal_5fe3b2e13c76b.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/gipusiluvosuvetukofopekig.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/nn9eicw/pull_him_out_game_level_187.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/ciajiji/mekakoxirapixomaxizapeti.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/hfwodUO/jawubidanagos.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/10704510393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_600a7c7383f93.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/voxupovobusese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutejaxevewef.myartsonline.com/52075068294.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/hush_hush_becca_fitzpatrick_ebook.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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5252 bytes
SHA-256: 405af545c98aefcdc13f006642755801c1a46ea39579d8b5f19508135d12c7c5
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10960 bytes
SHA-256: 1af3a48b61e504b2ad29769e261395029527396e833f17f5ee2acee03ca5b315

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