Malicious PDF — malware analysis report

Static analysis result for SHA-256 231370025961ddcd…

MALICIOUS

PDF

76.6 KB Created: 2021-06-12 17:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e509d27a6013a9336a8c6c227565cb4a SHA-1: f069bb76d97bf78ae4a48dc8389c5b5505617a6f SHA-256: 231370025961ddcd9dc78b75b6746ada4788918ac340315572e3689a80e03050
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, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

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://xezojetit.ru/123?utm_term=lightroom+cc+app+android PDF link annotation
    • https://dagojamigim.weebly.com/uploads/1/3/4/7/134763314/bonopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fd67295bd387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_6041cd8423dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_606c6de48d2ed.pdfIn PDF document text
    • https://lipijubirenazob.weebly.com/uploads/1/3/4/7/134722159/8228934.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/44273e.pdfIn PDF document text
    • https://nilozirarita.weebly.com/uploads/1/3/4/4/134463528/kajawexexapap_latavo_vujenitix.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/a4814773d20c1.pdfIn PDF document text
    • https://sofaruxilo.weebly.com/uploads/1/3/5/3/135309187/lapunofusone_fixuxetak_juxosurerujenif_fofega.pdfIn PDF document text
    • https://savotawap.weebly.com/uploads/1/3/7/5/137509548/252509.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/6629629.pdfIn PDF document text
    • https://jurugifako.weebly.com/uploads/1/3/4/8/134869201/5958602.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/097dc312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_6028ad5b07e6c.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/34e59ade-50af-423e-bf21-bd5425ddb5d5/68031238382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4a8f3c-45ca-408e-926e-0ce300a85931/how_to_reply_email_for_interview_invitation.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/vajaminegadamanajat.pdfIn PDF document text
    • http://xulajirose.pbworks.com/f/maheshinte_prathikaram_tamilrockers.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/kujidofoxawimuku.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/papifenuxotowudovona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1df810-e036-4717-9b52-6f45298c8643/40k_9th_edition_rules.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_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 5220 bytes
SHA-256: 58a61411afbdef35f2d59d67aad92388aff2c0035c44797ac1f3fd520b2b3151
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 12756 bytes
SHA-256: 1821f350c7c4b96dd1b4a9471ec4e546041396df81b023c7993cdfb6fd2dab35