Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bbd756c68ecede…

MALICIOUS

PDF

82.7 KB Created: 2021-02-17 11:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 16c5b7c5bf8ba4adfe4eeb4e2bde6cbf SHA-1: f3d6342ab85f8283fbc258df94f50fc9fac9f463 SHA-256: 07bbd756c68ecededc135324bae9353b87723cdbec30d7e33a1f1052aa823110
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on disposable domains and potentially malicious redirectors. Heuristics indicate it's a link farm designed to direct users to other content, with one URL specifically flagged as a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/wix?keyword=bloody+sunset+hacked+unblocked In PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/9508138.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/jihgg2p/1447287193.pdfIn PDF document text
    • http://mgacessoria.online/52442569152dzgzx.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/qigqha5/dream_league_soccer_glitch_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/icajffa/2278303353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_5fda4d6360477.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/iagfji3/newivugox.pdfIn PDF document text
    • http://aydym.club/pojogamevqp9m.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/683824408733mtsi.pdfIn PDF document text
    • http://coins24h.com/tedodifidgppo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jexijer/monokisosebewu.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/varicocele_nhs_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/budget_reform_definition_government.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 5284 bytes
SHA-256: 0e90d297498d73d25e535c7838600e54ae022e7cc5e83891d57aa1d595b9ba86
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 11004 bytes
SHA-256: 7c4b7c572fdf8b25010288715fb0ff81bc3ba6d7c0ae1b9aaaeb9062f0107ef0

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