Malicious PDF — malware analysis report

Static analysis result for SHA-256 216cd0cbc7a7660f…

MALICIOUS

PDF

72.4 KB Created: 2021-10-04 18:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8338462c4940ba00027754c5190524c6 SHA-1: 0ae2ff0e0dfd6645462e1c16639fea77b2609d78 SHA-256: 216cd0cbc7a7660fbd49f88dd31e62216672c661ff4805b28698637ba10bc29d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://clingac.es/d/files/jufigidevubetanimi.pdf In PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/sodurezulepumitodarem.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/lodejof.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/dojabukanibivedujiwofitaj.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/padazudadokujinunukijur.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/41930894412.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gozukopivadulajeridutife.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/pamiletotitosidena.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/62081290329.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/90254579001.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/dilasegujote.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/budemasojanuwatinozeri.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403d1a67bac---26526804456.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/47825312760.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/xasebonizamovexabotuki.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161556c3834480---zofizivurapibarejoje.pdfIn PDF document text
    • https://rotitelor.com/contents/files/28000637157.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bufopajefonefogedesi.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/82539645440.pdfIn PDF document text
    • https://geniodelweb.com/file/fotaruwodidedi.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/jasatagi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc8dba2a---zegezuxevawekazonasegax.pdfIn PDF document text
    • http://archbot.pl/files/file/nifegezofudofiruxorurux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sports+live+tv+apk+free+downloadPDF 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_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 10812 bytes
SHA-256: 3fedcf780a2496815961c6c0ded5191b17e5551dca547e23e47eca50402540d1
font_02_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 16264 bytes
SHA-256: 19606abb2115aa2552cb6126e4d661c57418d9526d2fc6bd5558e0a8c21afe94