Malicious PDF — malware analysis report

Static analysis result for SHA-256 83502c549dd8ab38…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 13:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c984260fabd9a8d239d5437f424eecd6 SHA-1: c3c7394df898a1debb88779f170858923624c7ec SHA-256: 83502c549dd8ab382b5ef4bb28fa58a3ac31303d00e940ed034a23160a5e5f2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=play+store+apk+android+8.1 PDF link annotation
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/19075183554.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/51440281281.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/zebivosi.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/xaxewajopupi.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/xotefomagolexuv.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/totalakugepewin.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/52021677635.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/42346008020.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jujuleg.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/6591856715.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/paxapujebidimeti.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/fegetarodimen.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zasatifajan.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/16116821789.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/1726486338.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc9a7c40f---48578033463.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/vukaluradifuzo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kezik.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/82296571861.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/fepedibobubuv.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210918142433214.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/bedejemonokebiwulaz.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/sojomewawefufaf.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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 10916 bytes
SHA-256: d183dd3f7d0f6321266145aaf3737950decd213bd9403c071c371fd4b051600e
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 18168 bytes
SHA-256: 702a2c8ed78b72cce3ba992983a5cf6243836a3086ec453d9b574169892fd535
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.