Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0937e00b1751cd2…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 00:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca867dddfabe7aa6a4ae7a5e94c9de1a SHA-1: f60f2d08d7d886479a53ca5230f12bbde52686ed SHA-256: b0937e00b1751cd273afb8374bc5c47f85d6bd9424cd0a5c247e9fc25d7bf754
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or link-farming campaign. 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 malicious redirector, likely intended to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=injury+report+49ers+vs+seahawks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_603bbe10a65b8.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/WYTrBxD/bedoyecta_inyecciones_en_mexico.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/how_much_is_a_cochlear_implant_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/fgehjgj/buy_sell_comics_near_me.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/74910960542.pdfIn PDF document text
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/963aa5aeddbb0.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/pafalaju.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/30462799841.pdfIn PDF document text
    • https://sukorajonivo.weebly.com/uploads/1/3/4/1/134108587/nixomenanul.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/katatinazixiwoxo.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/phonetic_exercises_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_603e9ac134b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/pnnKjd6/46200015523.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/cross_sectional_anatomy_of_brain.pdfIn PDF document text
    • https://xuvevajepew.weebly.com/uploads/1/3/0/7/130739459/xovopawukuruv.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/afgcjcN/brimnes_ikea_bed_frame_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/yhcjiS0/64908747133.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/9ifGihW/edf_gas_meter_reading_calculator.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/c87dc8c1-31dd-4198-8860-324d47eb1857/calendrio_de_2020_com_feriados_rj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadf1f2e-29c9-4552-813a-7534668c852d/data_science_handbook_usyd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883e0990-7cc1-4f9b-903d-5a4a055f6992/how_to_login_smart_bro_zte_pocket_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54922ff5-31f4-4494-8348-ae863018497d/kenmore_water_softener_hardness_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbc623b-de56-40b6-9d22-4167e9ca2dfb/kupepedodawab.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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5452 bytes
SHA-256: a6ce45b16f6ad33f36db18a7975f3ed2273da37ca6e95894c8d66c3c7936eb3b
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 11472 bytes
SHA-256: a2be033bfcc412909ca64c4a0230f119a2d05fc915c67a20f4e3ec8dbeb6dc1b