Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79e28337894b18d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 18:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 358275340abe5b6afc1ebc95e34bc0a3 SHA-1: 921e6e8738162b04faac0e6e181999de80ada662 SHA-256: a79e28337894b18d7525d113b47e96e999c9188861a7c2b516c1d7a7f47e0de4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a phishing or scam pattern, where the document likely prompts the user to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious sites, aligning with common PDF-based attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • 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://robwalker.net/fckupload/file/63713676190.pdf In PDF document text
    • http://loscogliodifavignana.it/userfiles/files/toxesokoxeraxa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1bda13b36894fdc268383044e8174a/78660863761.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/6675228916.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/ropiniboxigafu.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/duzoxuweso.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/46025322910.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/31526549105.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fuxenir.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/romol.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/difitobadafige.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pegakebaxaketopagej.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/buluxikaneberuger.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xetixepobalorifapabo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/48738685359.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138190a54e11---54169824291.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/61737497714.pdfIn PDF document text
    • http://lse.hu/userfiles/file/61755924262.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/faveropipetaduzotuxodix.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/71032060107.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/rusamibilavugivaxubiru.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/viroxomemevafafap.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/detisoxevibajagigiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=purchase+order+acceptance+letterPDF 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_off0000bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 17180 bytes
SHA-256: 6a65ed51c01abf4f57fa72d2d8ea9dcadf49f890b05b1f62cba583d000cb4b9b
font_01_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 10620 bytes
SHA-256: 33041d944d825e6571b5b9765a337bc87c4bf3f6161415343004d131aaee0bbf
font_02_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1