Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0fd53be73bf09c…

MALICIOUS

PDF

72.9 KB Created: 2021-02-17 04:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a040ca386ff670fbda60edf75f7fdc36 SHA-1: daf950af2362486809eb653570ac7c2c4ba3789f SHA-256: ef0fd53be73bf09cfea50a480bc671f64d70e7fff48348bae5316a1f63f100f3
156 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 S3 buckets and other domains, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing or trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=par+quoi+remplacer+le+cognac+dans+recette PDF link annotation
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/8800736.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/ichoOy1/electronic_components_store_in_lebanon.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/gjd9Mja/narrator_voice_app_mod.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/tapozibadufulek_wudepolavek_gijikuv.pdfIn PDF document text
    • https://mipupupomekux.weebly.com/uploads/1/3/2/7/132712043/3e59a1f7.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/4480306.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/nakuzafol/net_framework_3._0_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/zulugupubavurezo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/bose_earphones_apple_vs_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/principles_of_abrasive_water_jet_machining.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/94195379014.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/77681994566.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/46646590419.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/block_ads_google_chrome_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/lafiwa.pdfIn PDF document text
    • http://bivuraxut.rf.gd/android_store_app_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/aroma_rice_cooker_4_cup_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/3631682094.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 5520 bytes
SHA-256: 3607f1d74ba9fc223c26ff2b3e52f1fadd729df9dbb0ace044247d17cbac3863
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 12368 bytes
SHA-256: a58cad4ab0e3b6f8b6f3ddd283f912fb292d594fc578eb77b37bf4dd3755b7aa

Open this report in the interactive analyzer, or submit your own file for analysis.