Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a588d870a54520…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 16:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bab7bcd5c64918317ee63e0321e6300 SHA-1: d27206eb4e8e5c284a29b8a6bf208c818adbe4ec SHA-256: 00a588d870a54520ac36f96641fb90407e4075e35de8909c812a92f6c58e6104
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to facilitate phishing attempts. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious intent, likely involving the exploitation of PDF viewers to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://thaoduoconline.com/userfiles/image/file/vebozamapamilezixot.pdf In PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/16542567551.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210913165749.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324db35d3c7---tadilarurarimes.pdfIn PDF document text
    • http://geasit.it/userfiles/files/61939857755.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/vuwudozijirorujavubupev.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/79791243522.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/14350773404.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/kizewugoxazafubekeno.pdfIn PDF document text
    • https://cardolf.ro/files/wetuje.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/62520347106.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/zusedi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2db8e041f1050afe00af7458b7d40d90/87650039176.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/levejotoneboloja.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tatalowenotakuzeluribemu.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/86292812097.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/10271449600.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wawogemojafigarugiv.pdfIn PDF document text
    • https://susta.vn/userfiles/file/18081460899.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58879406812.pdfIn PDF document text
    • http://kunbot.com/upload/files/90928357531.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/66061950660.pdfIn PDF document text
    • https://posh.hr/files/86388156627.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109041951312715.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/duvotixudodavoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+leaf+green+master+ball+cheat+codePDF 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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 18336 bytes
SHA-256: 6bd9c80a1153991a6b79719fd191f072bf062bd6be2d5d68478fac1357473408
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 11064 bytes
SHA-256: 3dffe8dee08e7d7aa6425a11be88f05e156bb4cee7f9214539924d8d203c8cf7