Malicious PDF — malware analysis report

Static analysis result for SHA-256 871183550baf329e…

MALICIOUS

PDF

70.1 KB Created: 2021-01-24 12:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 966490dea74f6e2e544b58df88e9f33b SHA-1: 50499fd968c7cf039ed5c9ead89c21f5961d0fc5 SHA-256: 871183550baf329e616e820859085167692d8c0c150c3ae211f18b1e0c0a86f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

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
  • 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.
  • 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://trafftec.ru/aws?utm_term=stoke+newington+sixth+form+school PDF link annotation
    • https://cdn.sqhk.co/jawutuwek/gfHHHb1/nanonojavipubumowev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_5fea38fba0dc3.pdfIn PDF document text
    • https://vavetupabon.weebly.com/uploads/1/3/3/9/133999816/4614331.pdfIn PDF document text
    • https://lanufuxag.weebly.com/uploads/1/3/0/9/130969896/zasunalirepuvoz.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/pkv84ii/77102931436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdb94f8d2b97.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/bamunuxebakedinaro.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/hbgeUii/rovot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fee0fc21233d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fec149b7e9a1.pdfIn PDF document text
    • http://eferevole.com/kuxofoxosurw6le.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_5fc898ca2d0cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484624/normal_60016a3d70104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_5fd6359ac61da.pdfIn PDF document text
    • http://prizinsta365.website/53349212788p6bz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fd7c29616c49.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/dosalapasenow/lezinonowepeburariwen.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/75198517822.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/puwawutanupewobo.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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 5412 bytes
SHA-256: bc7c46056c8b1a5329d3ae7082c9ecedcf5f8c4e9a18646594f0b48792f1f893
font_01_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 10972 bytes
SHA-256: 2cf403efa8772dd29573a8f7b0ce6167f8ab6f4a7d185a21bd08fb4cbfbee48f

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