Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3df72eb352cc41…

MALICIOUS

PDF

87.1 KB Created: 2021-05-31 09:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f180332f22103ea422ef6bb208d061e4 SHA-1: 5c5f810dc240f9bf20f2578f670819326b57b35b SHA-256: ad3df72eb352cc418d45a11324e6f57f58d6c44cdb46c8cfe9aec498ef8e3ad3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=scratch+2.+0++windows+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421199/normal_605fe2ddf0cd6.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/tawupijabi.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/8496529.pdfIn PDF document text
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/82dde3bdc18.pdfIn PDF document text
    • https://ketodoligas.weebly.com/uploads/1/3/4/3/134384615/8d824106.pdfIn PDF document text
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/begulurusegupas-gujatuzoz.pdfIn PDF document text
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/841586.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/8501917.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/pupugamuzi_jireburadoka_mitix_gejibexori.pdfIn PDF document text
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/besanagorusaje_nanemikir_vanawatigowef_jiwuberobo.pdfIn PDF document text
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/2be9fcee90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_60308b915209a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fffe15590919.pdfIn PDF document text
    • https://texerazijibegu.weebly.com/uploads/1/3/5/3/135302316/nekomed.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/8257388.pdfIn PDF document text
    • https://peribiziw.weebly.com/uploads/1/3/7/5/137511101/nemixomenajevexoxotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_602d2c17c8547.pdfIn PDF document text
    • https://fapizorimuko.weebly.com/uploads/1/3/1/1/131164308/batet_viweroropuma_gagezuxu_wovodome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fc842a176ba3.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/4ed5a59b-7831-47bc-b257-e03f5f7b7fa8/kunalinexetunakapalize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588072c2-d83e-49dd-bed1-9f5f191f61ff/kenuzemiwepojiruzeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea15bb9-a15b-4662-a640-e09b2f4eb5ae/20509363844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83043bc3-f8b7-4be4-8e02-6622cce46bc8/how_to_get_pictures_off_a_stealth_cam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97095da-0a13-4c68-9730-728310093902/52172565729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55c09b1-76e7-46b5-a951-d371a5da9090/hot_water_heater_pilot_light_doesnt_stay_lit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919f9b14-938d-40c4-9a4c-23594ec25fb0/67124284288.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_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 5688 bytes
SHA-256: 84bf56205bd9c60217e1a88f97f5120f92930880c455c3eaee04745cafbcb5ce
font_01_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 12976 bytes
SHA-256: e2dec1e29d3d5684371a7af7e0ee95f5fceebca294b4e434ebefb072e5fe356d

Open this report in the interactive analyzer, or submit your own file for analysis.