Malicious PDF — malware analysis report

Static analysis result for SHA-256 600ac139145c0878…

MALICIOUS

PDF

76.1 KB Created: 2021-06-08 01:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 912baa51eeb64044556eb7dcb8a0f177 SHA-1: c94040ea796a1fcb134b5aef12298c356905c0c4 SHA-256: 600ac139145c08785c2e8438351d83b1cfb6da10a1217b75e1dd99bffe2c5dd8
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 SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/pbw?utm_term=which+kubrow+is+the+best PDF link annotation
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/58a2d93ab.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/jazesafejefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_6024b0139e6e1.pdfIn PDF document text
    • https://vadekelovade.weebly.com/uploads/1/3/4/3/134372386/savarimasonareziw.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/862216.pdfIn PDF document text
    • https://fukokegoxa.weebly.com/uploads/1/3/4/4/134463136/zikevavixude-kivekijirob.pdfIn PDF document text
    • https://vusowosunuk.weebly.com/uploads/1/3/5/9/135975823/talopudoda.pdfIn PDF document text
    • https://zebesamixigibo.weebly.com/uploads/1/3/4/7/134725806/485293.pdfIn PDF document text
    • https://tijisevivojo.weebly.com/uploads/1/3/4/5/134502531/c34fdfa.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/e6aad7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_603bfa5ec9a05.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/877902.pdfIn PDF document text
    • https://vamekalufigo.weebly.com/uploads/1/3/1/1/131163651/fuwilogatosogi_bujubop.pdfIn PDF document text
    • https://piwusobalusuwav.weebly.com/uploads/1/3/2/3/132303181/tirenuwoxaginiz_lurilugawobedik.pdfIn PDF document text
    • https://naloguvobiwulup.weebly.com/uploads/1/3/1/1/131163976/gemilepukidogi_ragodezofitipiw_kuzidak_polegufumivedew.pdfIn PDF document text
    • https://papilezuserif.weebly.com/uploads/1/3/4/4/134437149/ec7b62e.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/rigoded_rukirupasebivot_sejamuja.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/a833202a-01cf-474d-8613-b7c140d2a7e8/what_year_is_the_hp_elitebook_8440p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b0d145-7a5a-4026-868a-849cceee3c87/percy_jackson_3_pelicula_completa_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7784a7a7-df5d-459c-b05e-68395780c4aa/6459475692.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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 4952 bytes
SHA-256: 8b50c10b9270f6464911f2b4aa494d2847be61fd53155a9e671f78fb7ab8c327
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10680 bytes
SHA-256: 0fd77565ad4386386208832cc4364f96e046eb7593625e4f9c9ade6df9f9927f