Malicious PDF — malware analysis report

Static analysis result for SHA-256 f574ff374c0d414a…

MALICIOUS

PDF

84.0 KB Created: 2021-06-07 20:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f0f05c4a080ac2661254fd00c9f7a5c SHA-1: 05d9e2a404267cc42bb320a82c9ad89368e1f3a8 SHA-256: f574ff374c0d414a2f9f0d6630640b557b52d1a3dcd1453d04dae169bb92dbef
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pixomot.ru/pbw?utm_term=netflix+movies+like+50+shades+of+grey PDF link annotation
    • https://mibajajezek.weebly.com/uploads/1/3/4/0/134017497/dawedadavasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fe418e7ba916.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/fonego.pdfIn PDF document text
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/potedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_6015fe05f1c00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fee080517bd3.pdfIn PDF document text
    • https://sodatavi.weebly.com/uploads/1/3/7/5/137509390/5379460.pdfIn PDF document text
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/pexezube_degawamagezob_pitunazekatexe.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4475572/normal_60afe617ec930.pdfIn PDF document text
    • https://refedekejevejat.weebly.com/uploads/1/3/4/3/134312363/dapodoma.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/4780537.pdfIn PDF document text
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/7243765.pdfIn PDF document text
    • https://loxufezikuwudi.weebly.com/uploads/1/3/4/6/134687227/kudorure_dimepidodazo_xenepi_xixuduz.pdfIn PDF document text
    • https://rotedovifiwi.weebly.com/uploads/1/3/4/8/134846651/4271907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe798f6223cc.pdfIn PDF document text
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/a5d1aaa96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofitesu.pbworks.com/f/54298334138.pdfIn PDF document text
    • http://buvulareka.pbworks.com/w/file/fetch/144616614/how_to_pair_samsung_tv_remote_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed77891-a8f5-4e27-9dfd-fa96fb8a90a4/king_of_capital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31b2e18-d5fa-49a8-b7e2-19b7da358725/tosogafotawudaretikuw.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/proceso_de_bernoulli_estadistica.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/30521743447.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/w/file/fetch/144610920/77986859605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cad14b-5446-4773-9d5c-8fc4b2c05f47/73908104458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba5ad0b-5307-423d-9f68-93fe3b88090b/34420100838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595cbe59-4cf2-4ca7-a4ae-6f637207d4da/lct_208cc_engine_carburetor.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012590.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12590 18320 bytes
SHA-256: c44f4a682cbfcfc63739f35a01bcb6a98659547effed701f47b232f7920137d5
font_00_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5848 bytes
SHA-256: b993c11ca9eb72b54a332542c358bc4a31230b968d38ad2b2f1da4744699d430
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 10684 bytes
SHA-256: 9026dd28db8258d79b618b2b06d4c2c51e57ab9c3807815f338f93d016a14898