Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f2aa406897ff53…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 02:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04e3ddd818ce4b2294bbf31eb5dddb84 SHA-1: 0da94489f9bb093cf1167ba6c0a934574cb02c71 SHA-256: b1f2aa406897ff534f45b508fdd546080d1c56baa7cb76765f1b883a777cd62e
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect users to potentially harmful content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=hot+song+piano+tiles+6+download
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ribisinig.pdf
    • http://konberdbio.com/upload/files/23144175953.pdf
    • http://bogaarchitetti.it/userfiles/files/dukubakadivebosapati.pdf
    • https://incense888.com/uploads/files/202109022233184118.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/tenadetenip.pdf
    • https://tefen67.com/userfiles/files/rufed.pdf
    • http://chapraptti.org/userfiles/file/nowipod.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/lezifosasokidexalo.pdf
    • http://vyveva.eu/UserFiles/File/rusorebesumurobilopi.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/87874489202.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/78506694088.pdf
    • https://mahanakhon.pacedev.com/ckupload/files/41977162367.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/kanevufisasub.pdf
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109111759096405.pdf
    • https://regiefranchet.fr/userfiles/files/dujave.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/11788429582.pdf
    • https://wasael.com/userfiles/file/18091149824.pdf
    • http://elpijisystem.com/file/55087855952.pdf
    • http://shanghaiqingchen.com/upload/files/lepin.pdf
    • http://hykylalumni.org/userfiles/93684550658.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/23290653123.pdf
    • http://topoint.net/userfiles/fckFile/20210913071237.pdf
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/31725106413.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_off0000e06e.bin
3ccf8be5a51449f95408f85ae7c860c51df7bfa31fb938f8bdafe8dd628b3499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10712 bytes
font_01_sfnt_off0000f8fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16792 bytes
font_02_sfnt_off0001110f.bin
5f4443856d8b61e8fde5768ca46a1bc3801ba192beddaf4f25499218a7368578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 17144 bytes

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