Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1f08ae14d62d36…

MALICIOUS

PDF

88.0 KB Created: 2021-10-07 19:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a665fb50bb179b653f7f2b9a05ff3904 SHA-1: f1e353a4105a934445bf794fe081ae2423e151d8 SHA-256: be1f08ae14d62d363113a4771889705f539f4ad9a8d5ec10b40d72e28ed72654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to potentially harmful external sites.

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://pixomot.ru/uplcv?utm_term=authentic+happiness+inventory+free PDF link annotation
    • https://steklo-shik.ru/userfiles/file/3897241096.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/80789097309.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/98007696706.pdfIn PDF document text
    • http://screen.by/images/file/lejeruzosaz.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/fuvogagimadugu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lizifapakixafokoxaz.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/28712770116.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/8406059063.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/jukajedelajovujobekuxir.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/pukotasetamovofuno.pdfIn PDF document text
    • http://cosyromania.com/media/file/vaxezus.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/savuf.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/72549757971.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/mixerarikunosebel.pdfIn PDF document text
    • https://papiratisk.cz/soubory/bufimefizoretijerunititu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vasokufumaz.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/33446800211.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109091145516553.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/85185443842.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/2320650390.pdfIn PDF document text
    • https://andhimazhai.com/images/files/40015230281.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109220900244534.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/55945178846.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/wutajeginoge.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/33677327415.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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10792 bytes
SHA-256: 639b21134d9e19e54687a2ad8f1fb9ba574efbc63af82ed09340d29c40d316d3
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 19720 bytes
SHA-256: b3b05c92534467eac754c9c61011a4534f08859ca68b13f2ae1dc9b227af2ff7
font_02_sfnt_off000139c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1