Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9ea6bba763534a…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 19:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0e60dcb44ae0bcd3355a2d96ae9da9d1 SHA-1: 3817928338d03c6b1aef211f5aeb3fc856f3456d SHA-256: af9ea6bba763534a278453437b1e4ba0278df5f741a82b183798eb375f8d00c9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to manipulate search engine results. The primary URL, https://mezovuduw.ru/award?keyword=game+maker+studio+2+3d, suggests a lure related to software, potentially to distribute malware or phish for credentials. ClamAV and ML classifiers strongly indicate malicious intent, and the structure points towards exploitation for client execution.

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
  • 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.
  • 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://mezovuduw.ru/award?keyword=game+maker+studio+2+3d PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420911/normal_5fe9daa84f5c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5fce9170ef065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449192/normal_5ffba62a657fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_601090465b8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6029255978feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fe7ce3f2c0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_6031c3a03c65f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fcdaea7d807d.pdfIn PDF document text
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/tuxopokuxofowidimos.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/rizovobobetaxujogu.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/wobopeziwifus_jutuzebajuka_zefifegivo_tudijitiguno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5feafd10e0629.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/nopelililujivut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_60242886de4e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fefde3233ca8.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/savukojubusum/vitimorenejogerinemazig.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/xununigumixokeripovumok.pdfIn PDF document text
    • http://ximogubofew.epizy.com/tumerokilivizojiwoli.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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 5332 bytes
SHA-256: a028abdef3e78c14424486a5601b9a90ef9f21b43b2d1e07093810c763b198b8
font_01_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 10412 bytes
SHA-256: 8436b7e905518ca9b8af92223c6aa7d5e3bd7a0374a235a219bcf1db36a90e99