Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc047ce56dacd0f…

MALICIOUS

PDF

111.8 KB Created: 2021-04-07 01:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 20e02925d370e14185c8dc4340ba7623 SHA-1: 0eb7fa82dacace315a6ef26663d1b74fd93ae8ec SHA-256: 1dc047ce56dacd0fe5547a7a0837968f2154b7e24f7c5fdfe7718abcd8d063a7
206 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, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no explicit scripts were extracted, the PDF structure and embedded URIs point towards a phishing or scam campaign designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/strik?utm_term=tai+chi+for+beginners+and+the+24+forms+book PDF link annotation
    • https://jilefufut.weebly.com/uploads/1/3/4/1/134109271/690c21.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/cuanto_mide_un_metro_cubico.pdfIn PDF document text
    • http://rujamuleta.iblogger.org/pikifefodef.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/mozezekuzekozi_musur_terutomuto_lifigub.pdfIn PDF document text
    • https://lolinukopo.weebly.com/uploads/1/3/4/3/134351434/wewow.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/advanced_excel_tutorial_point_download.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/wekivozivef-rafutilug.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/bivagubogu.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/2122225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biduxefu.rf.gd/amar_suyu_forml.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_40133a0955d24bebaf9c9dec7f016bef.pdf?index=trueIn PDF document text
    • http://wekazuvenasiwuf.epizy.com/62814107294.pdfIn PDF document text
    • http://legujajojozete.epizy.com/gafefalezibode.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_aef3327a56914251a5a401c8526c5c2a.pdf?index=trueIn PDF document text
    • http://rupaxabo.rf.gd/acca_f9_syllabus.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/wifinoparaniluvudulalaba.pdfIn PDF document text
    • http://tabowir.rf.gd/fatepanon.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_73d9d00361e34d739917e9f8a02dfc99.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_c5072b46b9d549d68c340205a968afa0.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_de37906f83124db98d96cd3b38ab94de.pdf?index=trueIn PDF document text
    • http://kojajopi.epizy.com/gelegutifake.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_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 39180 bytes
SHA-256: 640678b7aff7eda956b6bbbf7ea71b26e9ed8dd04ef8e23f86812ba9e8dc70cf
font_01_sfnt_off00017438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17438 5776 bytes
SHA-256: 60e603618564ef3dae37b14495c5aa8e800b1f659907683a98fbe62290950ef2
font_02_sfnt_off000187b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B7 13964 bytes
SHA-256: 3715360a09ba8982fb3743214b23af0936364d3d11ff344ba335bcb7f4a045f1