Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3357a7fc766dbe…

MALICIOUS

PDF

73.2 KB Created: 2021-09-22 09:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8868efe986e3a54401b88dab006deeba SHA-1: 74acaffd06176967166ab730137cd7704d57bf4b SHA-256: db3357a7fc766dbe7d9e546488bb78db1b74bc2ade7dde43323c41a563dbb2fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, likely to redirect users to malicious sites. The embedded URL points to a site that appears to be a lure for downloading software, further supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://oniceh.ru/uplcv?utm_term=farming+simulator+15+download+for+android PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f44a3ed0---wolowobufonabegofovowet.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/32352389081.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/13747194036.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/42900390091.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/65082109685.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gosanomarabokivevuladivir.pdfIn PDF document text
    • http://plncse.hu/php_data/file/wowavadipikulizexojam.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90270845330.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/wikezijinumalodurire.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161457152944a1---vakakotunipi.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gokojarabufozanatalifos.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/wobufaruxuvezuwukaveni.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/rulaxeposizaziputazutof.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021922154256956.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/dibukasido.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/xexevexipux.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210922142048.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/xawekuk.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/nufuxafijexi.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/14144080242.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/pudizefetukutotu.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/lefudo.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/ratalenituxafo.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/54933321886.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/zoxenawazabelebulof.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/penuzig.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_off0000bca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 16004 bytes
SHA-256: 12101bc2f608d0e8c5788f768242e1183a21639da4dc5e1dfee15a3a67c1a613
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 10912 bytes
SHA-256: c67d020c1f5a4d9a38db56009f40748a6dfe06f44d58e2a6539618494586c69e
font_02_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1