Malicious PDF — malware analysis report

Static analysis result for SHA-256 880541af28d775cf…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 17:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a9be4b4293543ce54a879010003f46b SHA-1: 6691192c29019b57a4493e371fe60d19669abcec SHA-256: 880541af28d775cfdfa0300af510d59ae5f75f7a9ab8fca12de3a3b33e2a7027
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user to potentially harmful sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/38676247459.pdf In PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/12130950172.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/91491922882.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/24717857620.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mulobopeg.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/mugamunegipukugu.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/gadog.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/26327169992.pdfIn PDF document text
    • http://oilspecchem.com/files/76688303564.pdfIn PDF document text
    • http://ailizia.com/userfiles/sefebilaz.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fexetajuwozibatu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69974158727.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/koderamewenaj.pdfIn PDF document text
    • http://sun-eko.eu/files/file/rukababasorexamamojuj.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sekarevizupik.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2644425ab69430d484ef7e17b3e58bea/35570850094.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/12384638138.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l3pr6u60ckeue15f7mkb05vuc7/jofuroj.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/36203410224.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/zoturenirupo.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/liwifiwujepezapera.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/maketafefalem.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jixixodilexuremupiwawo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/danuzamolozilexexigitolem.pdfIn PDF document text
    • http://freeorden.com/media/file/wodune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=latest+version+of+android+lollipopPDF 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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 10516 bytes
SHA-256: ca535eb4c584db9b54274869803b8c21c462366398c5e322e368dca1db3657b5
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 19600 bytes
SHA-256: 5746a5ca2b5d136368dee2bc0bdebbdb18f3cb0984aec20e431117f95bafb79d

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