Malicious PDF — malware analysis report

Static analysis result for SHA-256 2deafaadce0b79b3…

MALICIOUS

PDF

66.9 KB Created: 2021-03-21 00:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 060db10f820614f4466c02b2551fa538 SHA-1: beda9afb7abc0ce4fa1cea45fd2c9aa770bf9d0a SHA-256: 2deafaadce0b79b3cbd208e6b87976955f4206a5af164b806eabde0d39beb532
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity designed to redirect users or potentially distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://jacksth.ru/award?keyword=cuadernillo+de+vocales+para+imprimir+pdf
    • http://rosovutuwonemis.iblogger.org/brush_pen_alphabet.pdf
    • https://cdn.sqhk.co/nulaliki/ibjibR4/pozulidamis.pdf
    • https://cdn.sqhk.co/mogizufofuj/cR0jaRF/52486044170.pdf
    • http://takipibimaxubov.sportsontheweb.net/sobiraliwe.pdf
    • http://jaxixojuko.mypressonline.com/definicion_de_diabetes_mellitus_segun_la_oms.pdf
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/6804801.pdf
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/7125918.pdf
    • http://nugekurobeju.iblogger.org/lalusumirutisuxopewereras.pdf
    • https://cdn.sqhk.co/xuruwivagezu/ijL3yge/nattamai_songs_isaimini.pdf
    • https://cdn.sqhk.co/gabadifofibo/6FjahbS/bejavif.pdf
    • http://fosavaxenu.mypressonline.com/how_do_i_reset_my_xfinity_remote_to_my_tv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jojisoxig.epizy.com/excel_bedingte_formatierung_mehrere_bedingungen.pdf
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_44102159712946279fa675c3b64431da.pdf?index=true
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_064363712726459c8546c1ce11e174a6.pdf?index=true
    • http://firosuvidafodi.rf.gd/widuzuzuxabogasipivalatix.pdf
    • http://sovizaz.epizy.com/28569846042.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_60366bd583fd40d699042040d8b5b532.pdf?index=true
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_131bcd0f452848f186b777a52a06cf79.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c881.bin
de0b22358cacad419411af8a2a113d0e268353a03bc2cb40cd60814838567720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 5264 bytes
font_01_sfnt_off0000da57.bin
81921033c5668cf24083f6f1a466f2adea8aaaa25ddea6d6ef654b5ba1fbe3b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 10568 bytes

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