Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ffe7235be1cb1a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 13:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d38ae9e05e11cdcbdab467fe341cf174 SHA-1: c75bcc3ad6372020fce8ba2fe39252a6385ea390 SHA-256: 02ffe7235be1cb1a0f0f18f3087d8a9f1e947a2cdcdcaf10dc08d0ae4aecfeec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://xn--p3t29jo1ed4o4xw.tw/upload/files/miguwibenejoku.pdf In PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/27222509565.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/mebenesetuvibob.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/38300341290.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///2791050663.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/2559159343.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/wizujeliwokukutorujub.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84649848950.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/jusavakegubeliveludigid.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/19386120901.pdfIn PDF document text
    • https://blugarden.eu/file/nuvapilaxujugi.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/mafetupexokimudusaki.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/wovok.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/bisinas.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/baperobemaxubuluf.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/51227825568.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137766e77a72---84942276397.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/bowakolezuxo.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/latetuw.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e2a9abf---32827242751.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/nepureponutagugojipifope.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/votesesegowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=math+brain+teasers+5th+grade+worksheetsPDF 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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 10928 bytes
SHA-256: e2f82b30467cd92d94e0550b6da941b1f9cffe5250db4d2e7002ff05f9c064df
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 18388 bytes
SHA-256: 041f627f77495f31755501f55c78c62a1d8171c85bf6afee5e79644c9936b3dc