Malicious PDF — malware analysis report

Static analysis result for SHA-256 808258dbf3587bf4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 19:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41d5d4d5ed49b0225de28c8286d1431e SHA-1: 719ca7b5bba001fdc4e55b5ec0c449c50e9630c9 SHA-256: 808258dbf3587bf445a70fea7588b90bc97e92273575c6b3dc2fdbdca3404336
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=mookuthi+amman+watch+online PDF link annotation
    • http://goldcoil.com/uploadfiles/files/xodobakeg.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902090407.pdfIn PDF document text
    • https://12shio2.com/contents/files/gifosaturawokozuturilegot.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/95547591691.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/latuduratogoju.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/baburakagatisojuk.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/75515312512.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/81711054515.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/rezaxudep.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/10218225429.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/wapasositibavojalit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65028133882.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/tidiwodivesamife.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/fojokasigarejineziz.pdfIn PDF document text
    • http://rc-modeller.se/images/file///14017983168.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/71576299607.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83309803968.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/99314984243.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/rudenosiziged.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/loweretopese.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb08ab9c6f---88987434129.pdfIn PDF document text
    • http://epicridesnepal.com/files/bokobumofisa.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/texodevikibakexubomakobo.pdfIn PDF document text
    • http://limoride.net/gallery/file/korefiji.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/jozazim.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/13954904310.pdfIn PDF document text
    • 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 18492 bytes
SHA-256: 50dddea42ee529185017a6ae2b4b82f4d7b47dfaab0ad926d1e147b04e63aee3
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 10500 bytes
SHA-256: d9a7f16253bae21ec05b7f6e8103f76202aacbfef90ab7afc487c0a14c3b8152