Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7b918d14f5fb42…

MALICIOUS

PDF

132.3 KB Created: 2021-04-04 17:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f45ec924da22c59f997d31ea4e841ba0 SHA-1: 65d5d36c6fe404b90731cebf98c8690379671f95 SHA-256: 0e7b918d14f5fb427f4847d46a143b9b77eb0b62b638597018337b218f080f39
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=2010+freightliner+cascadia+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5fd8962e358bc.pdfIn PDF document text
    • http://easterthjg.com/daedric_armor_eso9g7k6.pdfIn PDF document text
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/sovafojetag-zebevoxojukata-monewidugite-wusamovotixi.pdfIn PDF document text
    • http://agreevudb.rest/15379096364q20s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_6022f0d890fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600aa9435c420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_604de9f8668dd.pdfIn PDF document text
    • https://vojoritus.weebly.com/uploads/1/3/1/1/131164067/cca02a726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_600e659959b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_600f58b4a69dd.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/382197551300930v.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/why_did_the_united_states_intervene_in_latin_america_during_the_early_1900s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_600b37f0759ed.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/gimofireroviteku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60383230b5f27.pdfIn PDF document text
    • https://besusawoses.weebly.com/uploads/1/3/5/3/135318815/suruxuzabikazoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fdf00a229277.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/5979602.pdfIn PDF document text
    • http://reduslim-europa.site/vowonamelaukyfw.pdfIn PDF document text
    • https://rofozewoguse.weebly.com/uploads/1/3/1/3/131384025/e21c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_60197b94f0e47.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/5917308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watusatuvor.myartsonline.com/dopogabijewukedoxo.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_off0001c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6F6 5756 bytes
SHA-256: fb1bf85be787a273b3f9e1a6bf5520f28fcaa78ccece2dbb8dfc92e97d0eef9d
font_01_sfnt_off0001da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA83 11848 bytes
SHA-256: 6717c0be08a66a01ec26b2d53e7839735668c187f3e5ad8ac5ef12cdfde7ec33