Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bff6515d83bb66f…

MALICIOUS

PDF

75.6 KB Created: 2021-04-21 02:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cbfeea6afe90b9714393bb437e09a66a SHA-1: cb4191cd81c3d32a06d5dc7e7b28e1685d46806c SHA-256: 0bff6515d83bb66f1d9a4cd844d76a533422fa39812dbdf334dc3eedadaf9644
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=tin+tin+chinese+buffet PDF link annotation
    • https://cdn.sqhk.co/gikokimofegi/1l1ijJ4/this_war_of_mine_apk_download_free.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/informatica_data_quality_10._2_installation_guide.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/3019544.pdfIn PDF document text
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/97b42de2a28ec.pdfIn PDF document text
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/guwoxo.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/e1c51fd34c.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/ejhyysr/dead_ninja_mortal_shadow_apk_mod.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/lopiwadegopipol_folufexegol_gapesi_rezalom.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/iONazH6/thyristor_scr_datasheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupineweso.rf.gd/digital_electronics_mcq_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3e2b07-2d6e-457f-87e6-ba2187e1ca33/philosophy_of_public_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c98f0c2-16de-41a6-807a-df498cd64bf6/what_is_the_history_of_math.pdfIn PDF document text
    • http://lubepigufig.rf.gd/visuwazelidopurupud.pdfIn PDF document text
    • http://riwugiboturom.epizy.com/dojaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e720a370-27ab-4d19-8444-b800d2547444/93399281900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b837d000-7db0-4e3f-804a-d0067ed8963c/dark_sun_dd_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8535ba2-f1a3-4619-9331-8960544ae833/moditunik.pdfIn PDF document text
    • http://zasujofimak.epizy.com/rafapofetis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85ce1f2-aa62-47b1-960a-1173f89a2889/fumumibejubukitogafifadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865bc9ff-5be7-463c-9277-64d01441c739/what_is_acceptance_commitment_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e3f914-2e79-4673-8fd0-78529160a97a/vuxikazemi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 2960 bytes
SHA-256: a3abab2e2afda60cb773fc8db5a284826273ca5667a1e8a6869216f715f5ab55
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 4720 bytes
SHA-256: 5649f6de3753d416650e418db76a11e14e28e9a93acc04dcfb925fe404309c85
font_02_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 11412 bytes
SHA-256: b49971683e833da7b13309c9972ee8212d37908c87d8eafcf1d549877687bf15