Malicious PDF — malware analysis report

Static analysis result for SHA-256 385089b908405ecd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 00:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37ef929326ad15ec9415379c7111bcc5 SHA-1: 1936477982a731c48bcba2c66935b5238ee56d0e SHA-256: 385089b908405ecd07d51c89cf8aa316dd6a3c596cc3220486606dbf85a96246
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is structured as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108b68e8f---refejafi.pdf In PDF document text
    • https://kocarbon.vn/luutru/files/xonifogekomax.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/zozotasovivubotema.pdfIn PDF document text
    • https://fong-cai.com/upload/files/maxona.pdfIn PDF document text
    • http://wohntraumgmbh.at/vugelijatetixade.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/76718366915.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/17608703127.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/sugewigeledusetoka.pdfIn PDF document text
    • http://polipack.ru/content/file/wobutezovejedetidepomel.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/xetonajepop.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/62675008287.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904170833919586.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/sunedexedugokit.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/55982852331.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/6898238806.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/motiziwusazu.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/puvudakebuku.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sigapezewoke.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/vutuwivafevoseforizam.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/59889023431.pdfIn PDF document text
    • https://protum.se/file/katatod.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/88626281286.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jakij.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/vukudeboroladekanowo.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/kawogalodorevolema.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nuwakeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+office+app+for+android+phonesPDF 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_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 17968 bytes
SHA-256: e84e0d0b17dc369b8a18324eede969d4e98ae703d7495c2aa2efa08b72281248
font_01_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 10724 bytes
SHA-256: 113743b06ffa5f0960256d5fdb16ba8b855def06906365df8aead516da1434c3