Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9bd1e1873ca0d3…

MALICIOUS

PDF

79.2 KB Created: 2021-04-14 20:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 93e484bd7906016c23be2076ca0ffc14 SHA-1: dac0f46ae7147233643fca85628f1ada8908fb36 SHA-256: 7a9bd1e1873ca0d3a0ec84122e25aa922fa3c0f95f8816c00d4ac71dc8c9c8c2
126 Risk Score

Malware Insights

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

The PDF 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. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=how+to+pray+for+marriage+partner PDF link annotation
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/ludowotigamifi.pdfIn PDF document text
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/899269.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/givaxad.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/foxojujoxojebale.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/15736.pdfIn PDF document text
    • https://bimidofun.weebly.com/uploads/1/3/4/4/134460432/6e085784.pdfIn PDF document text
    • http://nopefujozake.iblogger.org/97698266225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_60283bec2c4fc.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/vodoxojariwijan_fakigina_nopidurifudo_dobuxitasidetum.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/xofir_wadig.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/pewurepomizivodukufu.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/nilasizotot-sesagoxideku.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/lavan.pdfIn PDF document text
    • https://kuvovoturuja.weebly.com/uploads/1/3/5/3/135322548/fopeditasaperukobit.pdfIn PDF document text
    • https://kedetasogo.weebly.com/uploads/1/3/4/5/134599644/mefaw-mukivuliwok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_602fe6c74b1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_602ea26042f0c.pdfIn PDF document text
    • https://mixutexevegov.weebly.com/uploads/1/3/4/7/134706804/guvilikiwewozavog.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/webipejonavuv/smart_wristband_app_not_working.pdfIn PDF document text
    • http://zasasopatadinu.epizy.com/30171328441.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/wogaweketul.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_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 5168 bytes
SHA-256: 3534e4527da6a97de0c9fe2a654e5a499c7f83dfa5554fef2c4a3566115ad90e
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10684 bytes
SHA-256: e6ab34e85508b2884e3d37caaff1f43fcff1cf24ad2a66aeac1b29b393213328