Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed97c91bd20a34f…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 10:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ac351882f25fef4b623764a047324e SHA-1: 2c3e17bc2b66db58dbef0367e6db968fe44e06b7 SHA-256: aed97c91bd20a34f5b54c397f16a318c0dc221d243482b86d6d7bf7b03e82154
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, many of which point to other PDF files, suggesting an SEO link farm or a phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=autosomal+recessive+pedigree+worksheet+answers+amoeba+sisters
    • https://static.s123-cdn-static.com/uploads/4391636/normal_6002723258ee0.pdf
    • https://bumovewadenol.weebly.com/uploads/1/3/5/3/135318567/e18a1e1978a.pdf
    • https://cdn.sqhk.co/jefigujaxev/dsT6Bia/pagux.pdf
    • https://cdn-cms.f-static.net/uploads/4424009/normal_603d735a4bcbb.pdf
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/fd425786a1bfa0.pdf
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/tosomefa.pdf
    • https://cdn.sqhk.co/wopidevepip/PFZhcTu/4352096189.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_6016ff309c4a2.pdf
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/12fbf4fbb.pdf
    • https://cdn-cms.f-static.net/uploads/4492286/normal_6045f45ef3877.pdf
    • https://cdn.sqhk.co/bisadidizi/mzrijjh/video_call_from_scary_teacher_prank.pdf
    • https://static.s123-cdn-static.com/uploads/4409616/normal_6008f3a8009d1.pdf
    • https://cdn.sqhk.co/tixunudixa/PiaTjfT/kiki_s_delivery_service_costume_couple.pdf
    • https://cdn.sqhk.co/gidenateg/gmsGQ4U/hearts_deluxe_twitch.pdf
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6050ca7124c61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_7afd377d43d34f52bf66beef9e266e22.pdf?index=true
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_d9816a6150ed476ca8c609e922815e85.pdf?index=true
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_c71b8502c1a94ad5bed564d20018b841.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_b37fba4548bc49ebad0b1ef191c3c2a1.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_50eea626dc3d4800b00da66c92cdf92a.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd28.bin
0e89a068dae06b79875a352ca1f7f19bb53e06f6f72d92bb1097bf7f81296d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 5832 bytes
font_01_sfnt_off0000f0dd.bin
1af5de50c6fba44c715ba245ba1af2a9ef7635eb4ae1b779ada36bc858637d47
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 10564 bytes
font_02_sfnt_off00011533.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 16092 bytes