Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ebd458be2095b5…

MALICIOUS

PDF

100.0 KB Created: 2021-09-11 11:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8a35d117dfbe5ee74ed99eb22a0e1d1f SHA-1: ced4d87dd528347704f1971e318bb65830b3b2b8 SHA-256: 28ebd458be2095b5e582d83acf4e4a72ab70bf9af222e4ad27ceb8a680d4c460
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://jensbrode.de/files/file/fekerobixur.pdf In PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57205947638.pdfIn PDF document text
    • http://geotersrl.it/file/nasonazuxeridepotumi.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/mavederatepudiri.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/tebivakajumuzedikopodasal.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///52591646577.pdfIn PDF document text
    • http://offerparts.com/upload/files/xemajiwowukowerikag.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/mojonafijusime.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109110100095062.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/kekakeka1631074653.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906164818.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/65258481029.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/wenaza.pdfIn PDF document text
    • https://tivicom.vn/upload/files/37567031675.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202198138349902.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/masipitutevujerumuv.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tazinefawenefor.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/79782015435.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109061750469904.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/ruvubinu.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vefewesofufazazod.pdfIn PDF document text
    • http://video-cycling.de/files/file/jidogubuw.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/090913048440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=yacine+tv+sport+livePDF link annotation
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 17016 bytes
SHA-256: 28094cf9ce2e36eca2b686dd4db0ae1b34d94ab6da848491465441de3ac8dff3
font_01_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 10416 bytes
SHA-256: 1692eb7ae540ea62dbe9dc754105e24569e18addbb49f870ad4c49937d076d54
font_03_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 17864 bytes
SHA-256: 792bef124fc29da67440e93d3305650c36200191f19faddece09f508c4855b35

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