Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc0b71108d6601e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bdfd12fbaeef8b7379af3256f49c284 SHA-1: 91b896cda71d95be22350657948679fb6083a334 SHA-256: fcc0b71108d6601eb45a37c098a027c5f2d9ebbed47d212df59e45cb1f7ac415
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable domains, indicating a link farm designed to host malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out the use of disposable hosting and UTM parameters, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://agrostroi-proekt.ru/ckfinder/userfiles/files/66961820843.pdf In PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/laxevoxon.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/44101349473.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/lesigitemiraponevorubuga.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/gesupigobomobukasum.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/97620422709.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kibomejevuzoweverisiwo.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/559252305613206ca8162c.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sogimegisirusegisuperidu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138814ed5786---60928035084.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a7bc933e---xumav.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/8066124388.pdfIn PDF document text
    • http://myesen.life/userfiles/file/83548533209.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/57654876086.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/zajibejan.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/26276339625.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///32683251508.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/88058737765.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/44770323589.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/bizetez.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tapamexi.pdfIn PDF document text
    • https://ibextrail.com/editor-images/zatux.pdfIn PDF document text
    • http://uco-kampen.com/media/files/25641727511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bible+truth+manual+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 18328 bytes
SHA-256: e03f29e5e4a1e7f2da4fd3bbb3ccf41c285fb3a79dc66edb45782fd5b9f3e3e9
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10768 bytes
SHA-256: c9d04ae8f6ab2261027d46001a0eb72b886bbaa9252e42d04134a16dbaa984d5
font_02_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1