Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48898babf597802…

MALICIOUS

PDF

75.1 KB Created: 2021-05-31 09:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 32b72e32f0e31643e2c06719a3a479cb SHA-1: 37e92507d51d5e257c402b0fe59cc0f318f97751 SHA-256: a48898babf597802a96936edbf33ac82896527c0635a512cc2507e6d37f6e4d9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/strik?utm_term=guia+roji+carreteras+de+m%25C3%25A9xico+2020+pdf PDF link annotation
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/suxesopubewepim_pudiluxemaxinu_vomipoputazarej.pdfIn PDF document text
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/dejuzipabupuv_labawiz_betarevixon_daxotizuxuxadi.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/dimasatenepemas.pdfIn PDF document text
    • https://mojipidu.weebly.com/uploads/1/3/4/3/134391160/08ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_6067733e4822c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5fc859a83470a.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/fojexatoratazosomewa.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/detorilare-tirusivo.pdfIn PDF document text
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/14049.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/fc8df2a0f.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/1afd0d24b28573.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/dodixe.pdfIn PDF document text
    • https://bexokibuki.weebly.com/uploads/1/3/2/3/132302940/4603246.pdfIn PDF document text
    • https://fevukujiloz.weebly.com/uploads/1/3/4/7/134733145/8056009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_603d893e4476d.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/zuwurotawuv.pdfIn PDF document text
    • https://fixugosotodig.weebly.com/uploads/1/3/7/5/137518485/nazumamaf.pdfIn PDF document text
    • https://zalatedaduliwa.weebly.com/uploads/1/3/4/8/134881590/jobobokuvaralujafijo.pdfIn PDF document text
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/bosoj.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/5992160.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/zuxumuzazafov_xikuwonagel_kewadegij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 5860 bytes
SHA-256: b440e7c7f52c8e7dcb20909f0111c1a6084b0d6e734bf4933b8e33ea1a746b70
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 11988 bytes
SHA-256: 27692156cfc33b09f33c1e90d65415947be623228ea990b249efc37f434bf782