Malicious PDF — malware analysis report

Static analysis result for SHA-256 c446dfcac6fc32ac…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 18:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dbc10684beee633cea9513f43a532a7 SHA-1: 9b22c0a68dd3dda01ccd565898e07eb301f3f9a6 SHA-256: c446dfcac6fc32acc8ddd4b32391e5cf5d5a719c862dc7f9dcef8183f80aebab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically pointing to a link farm designed for SEO poisoning or malware distribution. The PDF's structure and the presence of external links suggest it's part of a phishing or malicious content distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=minecraft+story+mode+season+3+apk+download PDF link annotation
    • http://www.amedna.com/userfiles/files/73481100129.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/58852046086.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324133ee86f---57161206339.pdfIn PDF document text
    • https://apra.pl/files/file/zukonulumezubezo.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/digewu.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210907165556.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/nevumekolujiruz.pdfIn PDF document text
    • https://shunnasato.com/13175976789.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/pufanonigab.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/refalafos.pdfIn PDF document text
    • https://tadimtursu.com/image/files/zuwusa.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/zavoxokofasad.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/90041738438.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109130651374741.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/jugekozoranibejajilul.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edddc74310---39227326570.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/labaxef.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/46609098924.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/nunugurumaxo.pdfIn PDF document text
    • https://capecoralliving.com/media/file/3133820524.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/febaxariwijokugekozul.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/josirulurarigeveginepe.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/97270766241.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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 17112 bytes
SHA-256: 8b5ca65a183c99bfd21d7c083029cffef457bc8774be0cd483a3efa5ec2a789b
font_02_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 11236 bytes
SHA-256: be2f08124301ec2503fc431fef7e16c05d371d24dbdb1d17890d45532e21ec92

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