Malicious PDF — malware analysis report

Static analysis result for SHA-256 b736cc10bd32b798…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 241fe4c3f6b944bf3cd673c82e8a39e8 SHA-1: f9cc6279a5a2ff22f76f6506ab5108add56908b6 SHA-256: b736cc10bd32b7988a9ae1febaa84ec278a77d55a517cebd261df98729d6beb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jacsonsfurniture.com/userfiles/file/tutodurejonovujuvoxusak.pdf In PDF document text
    • https://10glazsikeyrosa.ru/file/20177366871.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/3955502689.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/6867613784.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/supazumibovuzevubi.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/69454913393.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/61767120417.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/jijenisibak.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zixukaxijameboveketuka.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bipinipozonalisikufixaj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d05120326---1995468422.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/detisoxevibajagigiw.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/tisapu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43e5db3ab---nerog.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/34962702194.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/16/75139193705.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34414358811.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/53013825282.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/zadapojiropavonovipu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/tufusofozixa.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/60284197092.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/90724288150.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/nibikiguromipogazagavuto.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/5111220277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ninja+gaiden+snesPDF 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_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 10164 bytes
SHA-256: d70e180be63c627c6c8221a93b39bd7794400ede16ff777d0fa3901b089ecd80
font_01_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 17112 bytes
SHA-256: f9c13480337de198866fe2c936b2dba9a759627a8d0b66f00b6dd31b5a490a1b