Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bbcc0c12901a4d…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 04:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbc1249b068e59c4170bf5a1b1d9495b SHA-1: 108539f57c129993321ffb238c31e04d53115bd8 SHA-256: 91bbcc0c12901a4dd197d31c305cc3e949f667bca991db32c6f15b7aba3acacb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous external URIs were extracted, with heuristics identifying the PDF as a link farm on disposable hosting. The embedded links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=monte+carlo+putlocker PDF link annotation
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/kikodebadizuden.pdfIn PDF document text
    • https://apra.pl/files/file/68358632057.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/78685455728.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/papamipinabujuvazata.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/fepesabo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161300b5d2766b---ridelifidusop.pdfIn PDF document text
    • http://potya.com/felafekazokuw.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/84579724624.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/58062363425.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jakitozexakagolez.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jedewisumuwuvukonogejar.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/75101553787.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/samolavewabidedunifine.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/parowawovobetigobuj.pdfIn PDF document text
    • https://eetravel.net/file/sowezuxikewuludopekuwud.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/xigat.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/zipuwowinezapinifugom.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/ludoxotarifawobegil.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a412135b9a---97829461283.pdfIn PDF document text
    • http://mn-lawfirm.com/box/userfiles/file/zobevum.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/noliragezutugewokodoviv.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/tavibubefanedisagu.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/48777294852.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/36495238869.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/bozopirizopugijizedoparob.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/60847283982.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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 17116 bytes
SHA-256: 3df4ffc7945bae0c0e40390cd65f37e2d46f22febafc9128462405f80921720c
font_02_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 10292 bytes
SHA-256: f05cd8b22fb5899aa1adbb4b31d913042a932b2de678a02971accdb5840dc732