Malicious PDF — malware analysis report

Static analysis result for SHA-256 c044e5068eacdd90…

MALICIOUS

PDF

75.9 KB Created: 2021-05-22 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d7b1b8e62b56cfd14f848eb322aa2d29 SHA-1: 93ae040c5e6ec385826fbec0d2e839a4b23fbb74 SHA-256: c044e5068eacdd90c442139a1c264d241b33b84ce2b094d8cf00bb5d66322853
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed 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://bologen.ru/strik?utm_term=exercices+sur+les+mesures+de+masses+cm1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474989/normal_606e32b32a940.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/7728352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_60687405ca35f.pdfIn PDF document text
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/d4192909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_602538898ad17.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/eae86d84f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5ff9d872ab183.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/tejimimoxusow-bixidadevobis.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/6197275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_601daa8f1dfa6.pdfIn PDF document text
    • https://genolawibiwiz.weebly.com/uploads/1/3/4/3/134316454/23ad458f5a96.pdfIn PDF document text
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/muroliruve.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/lekexopaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/baldurs_gate_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/medical_alert_vs_philips_lifeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c621b311-3c8d-4fa2-9065-a35e2653aaad/libros_la_meta_completos_gratis_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a002a8c0-6673-476b-aaa6-140b0709a411/sewowafuwivapuzupurote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fdd457-c4c4-4f5e-85c4-5d7b958117ee/how_to_replace_ink_cartridge_in_canon_printer_mp490.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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5160 bytes
SHA-256: b8922ea2b814bd86fc25ffe92291e8e92b5834de23d9abc1fddb15be8d3c85bd
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 12152 bytes
SHA-256: f7d95cda4e2cb54b37290d73bfb98e4c7535ebd6a3bdc4d7e9cd49ddc11bb6c2