Malicious PDF — malware analysis report

Static analysis result for SHA-256 918d600ea9f5386c…

MALICIOUS

PDF

87.9 KB Created: 2021-03-20 07:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 45889f0a068af04be1c5bd9763db231c SHA-1: b4887973b040a1c71c3c7ec619eb27cd68890bc3 SHA-256: 918d600ea9f5386c094cc72f5320200a2f91b2856f537269ce2b5632bcec58c5
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 pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=what+are+the+different+types+of+cultural+conflicts PDF link annotation
    • https://nikusajim.weebly.com/uploads/1/3/4/6/134666133/8949707.pdfIn PDF document text
    • https://telutifezidawu.weebly.com/uploads/1/3/4/6/134624569/tujubiraxetusisa.pdfIn PDF document text
    • https://mekilogeb.weebly.com/uploads/1/3/0/7/130775247/kiged.pdfIn PDF document text
    • http://physcoo.com/redshift_cinema_4d_r20g0hiz.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/hItgfgd/pikakituwivarubabibata.pdfIn PDF document text
    • https://wusikizojig.weebly.com/uploads/1/3/4/8/134883510/xekulusigumixu_kozoxijidajezo_lomovarej_mijozewu.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/a4OnFig/advisory_council_on_historic_preservation_regulations.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/maxejusozel.pdfIn PDF document text
    • http://physcoo.com/temavofp3cb8.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/pr0ijvo/grisaia_no_kajitsu_episode_1_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/jhbicIu/monster_truck_wallpaper_free_download.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/c4025f9d-1368-4de7-8609-1c446a77de82/55027339427.pdfIn PDF document text
    • http://panadokopejed.epizy.com/suzujazigajereselisawetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5877a39c-0b64-4d4b-9b1d-4912991bd7f6/94585203194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5377da-20af-49e1-a1d8-77bda357e2f9/download_driver_hp_6500_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141eaa89-2b7b-4a54-af74-16d009373079/2185095755.pdfIn PDF document text
    • http://zaxalamel.rf.gd/39071440349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064ba12a-b495-4a39-a02d-6b2aea489886/joxewetedusakoboris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c5c9b1-6bed-4578-a784-a9a2bed326c2/perdona_si_te_llamo_amor_pelicula_completa_en_espaol_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736cba4b-b618-4c76-9231-648012f1c4e4/twilight_saga_full_movie_online_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7ba268-0b2b-48b3-8264-20466a75cee7/stihl_ms310_chainsaw_for_sale.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_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 5360 bytes
SHA-256: d9889ab2e38e4ac81d0e92e62fc34fee1f551ad5413a00686efe55fbf12f6096
font_01_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 11464 bytes
SHA-256: f17a4c18cfb959fc89ffbe9c8e1b544a351c45de6c99196821cde28530499628