Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0d2400168afa15…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 17:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 795a96a757327ab42736ec8ddf66b037 SHA-1: 79d45c8c6bf65c2ca385d36e72c977146b52df17 SHA-256: ad0d2400168afa158946fcf980b4a09e0a084541679c978def7e977218e24449
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://engineersclasses4competition.com/files/others/28324014477.pdf In PDF document text
    • https://rajakedua.com/contents/files/41689559179.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/resikejoroxopakojebu.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/74211441708.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pepovudedakasi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wegatunap.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/74837625463.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/80323811445.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb91cd6c17---26256427526.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/6689263496.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109011043139582.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nuzijutefuzufulo.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/32787311190.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/ruzevuduxivosaxok.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/72704578680.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/89916430278.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210915_173330_153.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pebad.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/37109273071.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/mamenasixem.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/womokezutinagujovigovofi.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/83831023528.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/4443848793.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/pelebadaro.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/74637105155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+move+items+to+sd+card+on+androidPDF 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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 10628 bytes
SHA-256: 0d6cee858f1ecc1862dbd08802ce657cac484160a5eb7643fe5ac6e783abac76
font_01_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 18068 bytes
SHA-256: 12be2ce9458b953c3b101c1973232a50bc7adee9515b3b0c342b584131b1ace1