Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aa5ca5a7855afd…

MALICIOUS

PDF

41.2 KB Created: 2020-11-07 23:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 735f40002a341714d7a582f912340b71 SHA-1: 942842326bf76841ba298a696d2819c37778424f SHA-256: 77aa5ca5a7855afd77967dac33eacbbf18e1f2b8bf5543e2fae4a393bca46c3e
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links suggests a potential for distributing further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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/wb?keyword=nba%202k18%20locker%20codes%20xbox%20one%20cheat%20codes PDF link annotation
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/1614702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_5f977332cd873.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/e815fc3d.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/e99b9.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/jurivizibana-dumonuge-texeladiduvuz.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/55ce0e8f33ec.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/makotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac1114d-3f57-478f-bfe5-2a01da0fb502/sejuxekonuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/sevuxedokutuvoralesinuxez.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/vbuck_generator_no_human_verification_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dafosujusokajibarodis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2327b3-3ecb-47cc-9a93-98db89bd6fa4/gopizufotomipage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890a262c-2797-4120-b27d-38a40a3a808c/72049057118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e52b8e4-020f-477b-8431-dbfa010b4a48/rukexapedekeji.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_off0000610b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610B 5644 bytes
SHA-256: b9cff3831bde925f1731cfe5acfae01ef4506184d432bf1abb0e614f3e563e0b
font_01_sfnt_off00007446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7446 10492 bytes
SHA-256: 4b43eabe6e4de27a37b3b5f7954da5e8c9395b3bc1c56c54fd8924d3ae49aadf

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