Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41d2827667a52a2…

MALICIOUS

PDF

90.7 KB Created: 2021-10-09 06:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c790aa3ea94b19b9bfcf46c4bc8ec13 SHA-1: cefd5825d00c7d16c7a79279aa0edfba399c5be3 SHA-256: f41d2827667a52a2ab2ab0b09e5b4529c2b55c4afb96df45c2206459657b5184
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on unknown domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cortemadera.com/wysiwygfiles/file/97261174311.pdf In PDF document text
    • http://qdsenfeng.com/data/files/sovupatebekib.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/85614176219.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/14044509066.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/92176083383.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/zafekej.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210920221500.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/58111051574.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/28388714901.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/xurogodipagupitaxetozuf.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27521854647.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/26855812091.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/xafesugurok.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/muwugujukojurukapurixo.pdfIn PDF document text
    • http://patroha.hu/file/jebemegadejaki.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/wepivexilagetukekesugo.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090811449894.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/8179921807.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091723363873499.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bd756373---mabarabirasorodewazowed.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55821478518.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/50555182673.pdfIn PDF document text
    • https://sealskinz.ru/files/file/12429208700.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/tafafuw.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/66578504760.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/76056013046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=average+cost+of+septic+systemPDF 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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10832 bytes
SHA-256: 76831a505ca8eb4452fb0e9c2c8cb5ace49ef1f044eff90afc9c50fa165c6782
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 20276 bytes
SHA-256: 2215e0ef6569f6d1afb8bb05d563c0a18824b55774039c4afe72c7f696cf1b93

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