Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd51e94da01f3649…

MALICIOUS

PDF

76.4 KB Created: 2021-06-01 00:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75c997488add7facd7fa8e5ba7fd9de SHA-1: 99e575963d8109e120b7677154a8f934d7587330 SHA-256: fd51e94da01f36491a567084b3aa05fe53e399ca2e94804cbe52c64679922246
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=how+to+farm+brightspear+archero
    • https://mewufoxu.weebly.com/uploads/1/3/4/7/134743860/pokuzezigij.pdf
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fe68f1cc0f11.pdf
    • https://static.s123-cdn-static.com/uploads/4383692/normal_6008fce5264b2.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_606099f1ec282.pdf
    • https://takogazaka.weebly.com/uploads/1/3/4/0/134017011/e903f7c50d15.pdf
    • https://nuzupodulekego.weebly.com/uploads/1/3/4/6/134615520/57647f7fe7.pdf
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5ffe323cd13b1.pdf
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5fce8dc3a8d84.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/vamakatipakiwo_febegisitijeb_maxomosete.pdf
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fdfd59acfbca.pdf
    • https://cdn-cms.f-static.net/uploads/4478933/normal_601da0a6de268.pdf
    • https://cdn-cms.f-static.net/uploads/4447253/normal_5fe9176e04c7d.pdf
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6036e034a3318.pdf
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/160dfa.pdf
    • https://jazabibukunete.weebly.com/uploads/1/3/5/9/135962119/pixamomowaruzej-kokologorawurun-puguxegegejus.pdf
    • https://gexamefirizawem.weebly.com/uploads/1/3/4/6/134668325/7294235.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f73c1488-b29c-4879-a22c-05e0c8332393/dbms_stats.gather_table_stats_granularity_subpartition.pdf
    • https://uploads.strikinglycdn.com/files/bbe3e619-e888-4c7f-b34d-9712ae04fd8b/factoring_polynomials_khan_academy.pdf
    • https://uploads.strikinglycdn.com/files/ab7890a8-af4c-4359-bca1-e416fc2d98c2/razovagilemiwetaxabixo.pdf
    • https://uploads.strikinglycdn.com/files/aaae6da8-26bd-45f6-b1ac-8f04e0eb638b/pefabezenimibelixawigef.pdf
    • https://uploads.strikinglycdn.com/files/5d1490ad-fac3-46d5-813a-5a70f1ac6036/whirlpool_service_center_near_me_hyderabad_telangana.pdf
    • https://uploads.strikinglycdn.com/files/59701d0d-1bd5-41be-9761-b8e5c48c26a4/90318364531.pdf
    • https://uploads.strikinglycdn.com/files/af748c8c-311f-4f3a-9288-c539b6bf96b3/97333696011.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed14.bin
4f5fc5ee1435b731f77aa808e845acbe4938bf0eb660ddff584a9d17a0fa5ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5588 bytes
font_01_sfnt_off00010000.bin
de2ab6a755baf54d1e231f13b15bdc52e83ca864de6ef2f045e9bb97d1d56450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 10660 bytes

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