Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c5090cb129a702…

MALICIOUS

PDF

78.4 KB Created: 2021-02-15 23:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3c35d3023666e8f756577656c1704b28 SHA-1: 5e1ed0d6c647d05b0330ab82f019f57f997cde8c SHA-256: a4c5090cb129a702c4c5b277ac68514ec7119b1325b06422c432283f200d28fc
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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

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://seumenha.ru/wix?keyword=ms+cooper+dod PDF link annotation
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/wajakubugebojulo.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/gerete.pdfIn PDF document text
    • https://pufokebisuniga.weebly.com/uploads/1/3/5/3/135324869/8000530.pdfIn PDF document text
    • http://mazavunapefu.iblogger.org/angle_of_repose_of_soil.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/gixawetopoli/3_main_types_of_rocks_worksheet.pdfIn PDF document text
    • http://fisowafoz.epizy.com/backendless_android_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/how_to_guided_reading_groups.pdfIn PDF document text
    • http://betoratawetaduk.rf.gd/zekejozadopinaw.pdfIn PDF document text
    • http://zisafaziga.epizy.com/alage_alage_song_free_masstamilan.pdfIn PDF document text
    • http://lagamifex.epizy.com/33748242693.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/lagu_agnes_monica_ft_chris_brown.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/aashiyana_mera_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/7603521435.pdfIn PDF document text
    • http://xesujenomudot.epizy.com/tere_liye_arjun_kapoor_video_song.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_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 4828 bytes
SHA-256: f7b1fcff2c77e499db7b535fde853281a4a101a8fb0a58d1f7c618a9c9f4f94f
font_01_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 10356 bytes
SHA-256: a6ceac8cc60ac7751230ffc4c5daaf2203a1ff93a35760689a75f32fdfaa1004

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