Malicious PDF — malware analysis report

Static analysis result for SHA-256 229dbc5258718f9a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 02:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ddded2b47cdcbfd56898adffcf099396 SHA-1: d0abd6d9653363a56dfcd718334b854b32fe71d7 SHA-256: 229dbc5258718f9a411049e89ddf4edc8aeaaa389992b3ffc909b39e503ecb2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ottotech.center/userfiles/file/vijetetonowex.pdf In PDF document text
    • http://bjqyms.com/filespath/files/20210904023528.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/233104751.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wuzodexejovutisap.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/57097988129.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/67035900065.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/duxolivixifuzelobibi.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fixugedumododagimaduto.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/4098785556.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/9902395288.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/43867971929.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/28735378934.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/karavurusanavurowufof.pdfIn PDF document text
    • http://surtek.biz/image/files/20150323_005441.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/81233151086.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/futagarufitabadibawer.pdfIn PDF document text
    • https://birudongker.com/contents/files/70315058217.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/25984567921.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/60547730483.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/53491708283.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/ranosip.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/84692256851.pdfIn PDF document text
    • https://geloracinta.com/contents/files/48981935090.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sepatupefazafef.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gikaxugimufisoja.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/28211285436.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43700563012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=latest+android+tv+os+versionPDF 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_off0000c251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC251 16796 bytes
SHA-256: 31e4a8f7ed53ee9c542d323b8850f3aea2276efb7e641811ddc9491ce52092bf
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10216 bytes
SHA-256: 4ce0adb5a1051f3cb57b04203d7f35811131fd9b430bf95b8e3a704cd0b43748