Malicious PDF — malware analysis report

Static analysis result for SHA-256 36623a14d586c9af…

MALICIOUS

PDF

87.6 KB Created: 2021-01-08 17:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a8a4379d04822717b1328593d313d64b SHA-1: 228add997da9a37701cf924919a926014b0006a6 SHA-256: 36623a14d586c9af7e6e6483e5bb20b3c9ba53227d786cce1dde8194cb56d4c6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing or trojan threat. The presence of numerous external URIs, many with UTM parameters, suggests an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffset.ru/aws?utm_term=badian+canyoneering+guide PDF link annotation
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/gasuzoxil_dadede_rekapitidudo.pdfIn PDF document text
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/db282a32fe.pdfIn PDF document text
    • https://pajujetijawu.weebly.com/uploads/1/3/4/3/134334360/zubirowimavut_popekajotefux_wumobajut.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/49ad25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fc5718f80845.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/guwalokibirewelupeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_5fb9f87412212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_5feced1ebb55c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff168767a995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5fe90736938b0.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/6259383.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/200420.pdfIn PDF document text
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/5b07b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e5c0d004-629b-4fc4-abfe-556d72ac5085/torture_chamber_game_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13179c7c-2c26-4fb2-a697-b4761360c9e9/on_numara_tahminleri_nimet_abla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ab63ab-d9e8-475b-8c4d-850dfc9dc339/wobebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2d8a2b-b707-4857-bd0f-78a1ad7f73c7/stephen_hawking_libros_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 4852 bytes
SHA-256: 8c0008bac188fbc68a0392f324617ae12f042189ba79d72952dc6fd2db9abdcb
font_01_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 10716 bytes
SHA-256: ae15a4ffa904eb5c178ae258b1f8e3ca73c0064f867362b10c4f012391eb019c
font_02_sfnt_off00014308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14308 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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