Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08766327b1a31c0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 18:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 037780b5aceb46334cfa078f3e473263 SHA-1: 1b0a621cb66de8e62085602290f043f83186ec95 SHA-256: a08766327b1a31c0ba5960287af46236543840239751b6abd3e1b7a927b557ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to potentially malicious sites hosted on disposable domains. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=super+mario+64+beta+rom
    • http://quimis.org/js/ckfinder/userfiles/files/fomadotasebusojojemir.pdf
    • https://serviceservice.eu/userfiles/file/kenaziw.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/tipewuxikefitumumomiwix.pdf
    • http://vit-physio.de/file/kozusijutob.pdf
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109141214493766.pdf
    • https://ringid.vn/ckfinder/userfiles/files/bomamogupimopume.pdf
    • https://webaprint.be/img/file/disusaruko.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/lediruluzozo.pdf
    • https://idd.no/ckfinder/userfiles/files/rodegatowinekederegolibi.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/zetisopi.pdf
    • http://aire-limpio.com/img/editor/file/74884384227.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210923_164448.pdf
    • https://ykitraders.com/UserFiles/file/52212837059.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/tatasakakumedexawadosa.pdf
    • http://wamer.org/userfiles/file/vonuxixane.pdf
    • https://pasarangroup2.com/contents/files/wajabenimibobafugifanuzan.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614efe16c6520---48863407362.pdf
    • http://yugang360.com/upload_fck/file/2021-9-25/20210925184936241608.pdf
    • http://cnsgafgl.netsociality.com/upload/files/pezunogugevowud.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/gigakunezixedevewivujuz.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/39303314499.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/rerutojawuj.pdf
    • http://donateagift.eu/userfiles/file/zisojaremovafud.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/rokiwuxabelovibiriwilugow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ae.bin
c732963257046e96163028d25faa70acff94ad71827e3c6d16725018671e5f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 18000 bytes
font_01_sfnt_off0000e262.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 16792 bytes
font_02_sfnt_off0000fa79.bin
e11470266d686758d6d69798be78c2581c00c5af08e080cc874d70868a08035f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 10656 bytes

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