Malicious PDF — malware analysis report

Static analysis result for SHA-256 4438e68a6761149f…

MALICIOUS

PDF

68.4 KB Created: 2021-02-24 05:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fa1b19f218020291617489b0095c581d SHA-1: 712ca907a7fac9355afbb7589e999cc85aa193a2 SHA-256: 4438e68a6761149f4beaf9787fd010ab5bebe772c3b4f236965d723d80f69367
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=what+are+the+types+of+communication+context In PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/podobikomesumo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5ffc1d5ff2632.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/Bggihhg/xusegaxoto.pdfIn PDF document text
    • https://kitozegukelod.weebly.com/uploads/1/3/6/0/136056839/rupelakib_petiwasapi_romojivumuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fffeccfe8439.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/IifUjav/sakomowolosir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5fdb9d66e47e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_60322fb107b88.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/lusirisuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fe069be651fe.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/f49xOhd/lefetenijaxumufuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366652/normal_5ff80ce322d04.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/iJ6bjeS/fewobetexad.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/dgjgaax/rapiketirigirozepefepo.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/hicK5gc/sitorululibotapul.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/zusevamasor/cs_lewis_quote_on_fairy_tales.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/99370239921.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/free_algebra_1_word_problems_worksheet.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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 5408 bytes
SHA-256: 2cdd698b07bec2c55b5533509d2c59413317c82fbf8a0ef0c5ffc218a97d4f30
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10284 bytes
SHA-256: ce0c7b4500bffe289a4d52f1c8dbd78eb68d0d0324aa1e1758be31ee5f21505c

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