Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea1aa7ea6ca91a4…

MALICIOUS

PDF

74.0 KB Created: 2020-11-24 03:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bde18ce3cdddeaeea14dd84becf47866 SHA-1: 71af4b4badef67c4d256f5a2f9578f8b013f7e12 SHA-256: 1ea1aa7ea6ca91a428a10bf23f149f0661f3edfd4bd8e263c9d78726f800fc5b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference a report, suggesting a lure. The presence of numerous PDF links further indicates a link farm or redirection attempt, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=bisley+school+ofsted+report In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_5fb768baee271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f941c52cdb48.pdfIn PDF document text
    • https://tenifapinam.weebly.com/uploads/1/3/4/7/134711228/xefiwepaxok-rovop-rotigetefes-nuzekibarulib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fa6d4fc6516d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5fa0ac275ca14.pdfIn PDF document text
    • https://wufazovop.weebly.com/uploads/1/3/4/8/134884286/aead71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fa0d68e8e978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8c7a904f985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f94a1e587a3a.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/bisegilupuf/patagonia_jacket_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/banda_calypso_musicas.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5184 bytes
SHA-256: 0e3cc4ec717aadd18fa016eec1dd71069fe1370bb905a52c1753900c3e48d06f
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 11100 bytes
SHA-256: 8c4b9d3f0a7bf6e964fe6d20d74c1ce17c4be39f4fe6b504ac858059f2798441

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