Malicious PDF — malware analysis report

Static analysis result for SHA-256 688c3abaa110f4f4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 14:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7f83a4af21eb10025c5a1211f55f919 SHA-1: 17dd7910bd9f1c637eb69a20eefa616662080196 SHA-256: 688c3abaa110f4f4b8bf96fa16c4624e3944fc109e070dffe78c74bb23b4c922
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are structured as link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=idle+roller+coaster PDF link annotation
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/51858908191.pdfIn PDF document text
    • https://limsurempat.com/contents/files/26762204388.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13306800857.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/wevujo.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/ronusomuzefikefidixiw.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/6437356969.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/58732392280.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31750605653.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090123212973499.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/73888473950.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/gufodowif.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/87362347670.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/53512199653.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/13331800411.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/53190954278.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/zorijirodidisijilapis.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/18029565150.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/pujelirodurubutotilosas.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e79489eaf---41902118635.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zugoreturofizelonuvow.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zimikarexibomalumexudup.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134452384f29---27889076815.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/98756714715.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/57475848242.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wifalemanesujuwuvej.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/begezepeg.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 17856 bytes
SHA-256: 01742a51754aa507ba4520eaed6e7f3af1d7324d33487dd975e605670ed057c4
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10120 bytes
SHA-256: cfb3fa4ed44688105751f3dbf661a901a24a9d82a666a5fad9b961067f78b5e1
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1