Malicious PDF — malware analysis report

Static analysis result for SHA-256 785e6514c84b4e4a…

MALICIOUS

PDF

72.0 KB Created: 2021-02-28 10:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 816508e370eb70e6ee15672ece720370 SHA-1: d2ee3bdac01ce499bedf99af3eee786493f20de6 SHA-256: 785e6514c84b4e4ad82be9ba0a7b348c520131fe8df5b270c198f8b40b00afba
226 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The 'PDF_SUSPICIOUS_LINK_LURE' heuristic indicates an invisible link to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=samsung+m2825dw+flashing+red+light PDF link annotation
    • http://techanomic.com/92426642242rkv1g.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/20bd76d4f2.pdfIn PDF document text
    • http://hookup753.fun/lifososunidaovosd.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/ck4Hijj/flashdog_gfx_tool_for_pubg_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_6005ce06a729b.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/aircraft_ramp_operations_manualp2vm5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_6039b6fd8aedd.pdfIn PDF document text
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/gexesokafiwawalevu.pdfIn PDF document text
    • https://razavojukuraw.weebly.com/uploads/1/3/6/0/136090857/99d16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_6003bc807ac96.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/puvupuvalilugunepu.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/26d25b.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/O6ijzrz/fish_aquarium_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/au2jfgc/timedaruj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/fopibodevinujazowexus.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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 5964 bytes
SHA-256: d8a88e8c4a416f178024119d6109484ac898ea99529798c7b3cdc238a83005d7
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 10776 bytes
SHA-256: d915431e870ca14f58f6a2320de6f9c20bdf05912fac18a97c5c6dd1f7afdaa1

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