Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ac2552f4f9d562…

MALICIOUS

PDF

78.0 KB Created: 2021-03-11 10:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1ddc9ece7cad3c86b4bc1a5902230ec2 SHA-1: ebfaa1237cf4a13a45726dc42054a745dada6e29 SHA-256: 39ac2552f4f9d562228c6bb453b5ecd9621b612e485bb59ca919ad1af51401ec
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating a link farm on disposable hosting. The ML classifier strongly suggests malicious intent. While no scripts were extracted, the presence of many external links points towards a phishing or SEO manipulation attack, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dugedepap.ru/wix?keyword=stickley+furniture+outlet+north+carolina PDF link annotation
    • http://noksipals.online/duzajerewuxekufekasifae8o.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/law_enforcement_sniper_training_texas.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/19428923307.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/carcinoma_escamocelular_de_lengua.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/gupojuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_601fb59552194.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/1821026821.pdfIn PDF document text
    • http://xozonline.ru/how_to_learn_photoshop_cs345vob.pdfIn PDF document text
    • http://sweetygirl.club/chori_chori_movie_song_mr_jatt86ncv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_600c43fe6cac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_603e7fc08de62.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/60253467523.pdfIn PDF document text
    • http://pubguckazan.com/vinoti0awu6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_60158e688d565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5fe8a427524f0.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/jasadavebaga/chemical_equation_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/93929420192.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/how_to_replace_samsung_galaxy_tab_s2_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/3384332392.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_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 5060 bytes
SHA-256: 8d218a7c26eca04497b8f5c0561d295e6c990d0387fb24ebc22a60723fa749b1
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 10228 bytes
SHA-256: c294fd62b38957d49baa6ca3472039ea78a9c1028152e05d76dbd44a08b7ca2b

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