Malicious PDF — malware analysis report

Static analysis result for SHA-256 c191ef2b22be6d44…

MALICIOUS

PDF

73.6 KB Created: 2021-09-22 10:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be221e92330399d2acbd05c5e99723c8 SHA-1: 2d873ad0e86d03d07be18d93f95743c60a4f0039 SHA-256: c191ef2b22be6d44cd2c3678037cc6207ea953d435c0c71aa2b58f91ab04aa39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, and the overall structure suggests a phishing lure related to application updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=update+play+store+update PDF link annotation
    • https://theipbuzz.com/images/file/2406272311.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/renuvulixovipemanesaju.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210918114511.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/82870726649.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/60626976803.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109180021362376.pdfIn PDF document text
    • https://apra.pl/files/file/85352306949.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/wisakuvusez.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/50363030590.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/pomorimijokap.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/90285401947.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/viwejotojomadaw.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/fuzodatepi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/78890902335.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109190356144262.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65508392141.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/wodazumupo.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/69886960907.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/47659376090.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/52402487228.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e428bd5461---zodopafupuxukeg.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/wudubira.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/15206615531.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902220911304919.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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 16572 bytes
SHA-256: 817eeda680ac0e88bf0b57a4974de6befde743b791bea4765b971e13ad8d9329
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10412 bytes
SHA-256: 24df27381d39bbe86a967015ad739b46ab154d4c8181a2d5b62cdd9768c5619b

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