Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c052b7696fcdc11…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 21:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0841b9b43a8e9851d551fc48409b197 SHA-1: bcf5064322d5c1dbd2d456bcdbebf4bcea397cd9 SHA-256: 2c052b7696fcdc11116ec2e5f7dac331699911fe1c3c62e5f16f013f297a4614
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The primary function appears to be redirecting users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=glencoe+pre+algebra+2012+pdf PDF link annotation
    • https://homecareangels.ca/files/files/files/37824642341.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vofogejaxe.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/gobetefovaxusasatekoril.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/gipejofuwikezigumibik.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/fadexupunu.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/68578924158.pdfIn PDF document text
    • https://10fci.org/userfiles/file/lusakikom.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/72710064664.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121104425443.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/rewutepivatumamemisutom.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/56396208647.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/22779306098.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ebetuli00ee0uehnjotcvn68j5/37616558815.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/kibuzuburi.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/51002243437.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/xenasigisadapepivusage.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pugetajonofefafuzupuz.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/41830845875.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/81658783473.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/98431339930.pdfIn PDF document text
    • http://langyupharm.com/upload/files/85488935290.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_off0000bc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC24 15364 bytes
SHA-256: 28e1070c0d1fd55c745efd7b042ce00e849884c73c060d791519aeb152464ac0
font_01_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 10912 bytes
SHA-256: 147b4fb71eca479d227a45428759719d2b73cdad2619231cd05cc15d8eb2bd16

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