Malicious PDF — malware analysis report

Static analysis result for SHA-256 211074eb12c5686a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 15:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63bc8ab55605a075cadc9c4ff96d297c SHA-1: f449bce05451cc1239207c5bd3847c70b5cfba8f SHA-256: 211074eb12c5686aa02f9d7da3ad485d4b9209405e36d491dfc2e55003078678
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly suggest a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://atlantidegattico.it/file/22455698953.pdf In PDF document text
    • http://cyclad.org/UserFiles/file/gibubugajogimazifajejuxob.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/40052708849.pdfIn PDF document text
    • https://protum.se/file/73194105969.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/23994921234.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/59907096929.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tutaboparesiwu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tinezovufakevix.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/57428515760.pdfIn PDF document text
    • https://profesa.net/userFilesfile/80732325414.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/81899749993.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210911_A711D10844C71D3B.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/500e05e5fd32c29c7887773a6ff529d5/vatapujojegomonogodanogi.pdfIn PDF document text
    • https://kaparatt.com/images/File/67320695337.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/latetuw.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/fadunesokelekitukonot.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/wurokolusaripawufifasug.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/60929044111.pdfIn PDF document text
    • http://nut-shell.net/upload/files/pokipivofajexamenivozowe.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/41975524458.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/vidulegibemuzabudurinago.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/fixirejegovilemolebiti.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/24729965944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=disney+infinity+toy+box+2.0+for+android+play+storePDF 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_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 11156 bytes
SHA-256: 1e32aa371b14be6792cb59813b659c221541f4a1b0396f71df80e9566899087e
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 17380 bytes
SHA-256: 8cc83142f6d25317b522039e9f2365c976dccefd83a67c2e3eb4c00e90df4fae