Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3de445f3215fe2…

MALICIOUS

PDF

80.0 KB Created: 2021-03-05 08:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18b064b4f16badee130f545f6bddee83 SHA-1: 3c8a9cf86bef169b5c19b55d6e2852d776167fc4 SHA-256: be3de445f3215fe2500eea1ce6454aad19b0a58b8d7b772b2667338efd9dad60
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 domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely initiated via a spearphishing attachment.

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://maypoin.ru/aws?utm_term=court+of+mist+and+fury+book+order PDF link annotation
    • http://nepatokada.mypressonline.com/wobamusotidutugojakipopak.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/pobelema.pdfIn PDF document text
    • https://vowijavig.weebly.com/uploads/1/3/4/3/134319359/nofunol_namawewixe.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/dcs_world_f_15_autopilot.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/is_daphnia_and_moina_same.pdfIn PDF document text
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/marudipife_reliwisow.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/gogofopuwodinatexigixodox.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/zefes.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/linizimaderugekinati.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/20692741249.pdfIn PDF document text
    • https://firiwipavixura.weebly.com/uploads/1/3/1/4/131407767/c74dd0705.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/10341865046.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/2d86da00-2ec1-45e3-828c-74284e79a0c9/95906775522.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/fe_exam_study_material.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e5f0a7-8d4b-4a20-9f9a-44503a161887/nuwuvumos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522e5ddb-4c9d-40b1-ba73-d55104ea7329/45763663213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3045ebc-65df-44fb-844d-3dba4a16c08c/15118625860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6212e8-c6ba-47b1-a719-cb5c2f662823/xiseguraf.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_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 5232 bytes
SHA-256: 7967b03b8d2030507c248090afc0549cd30075aa3ac43ed3c727e1edfb60768b
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 2744 bytes
SHA-256: c58734b7c43f876d00250fe79027c28030c899bcb97b97a165465ed91b27eb93
font_02_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 12480 bytes
SHA-256: f2c8dd2add0894a9381812caeb0614e660157a07b7a77f3cd01364fd609fa5aa

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