Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5e1404f82888f6…

MALICIOUS

PDF

128.9 KB Created: 2020-06-14 14:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 848d2cd6ac8dbd7e96b03271f7735ddf SHA-1: c0e4afb1bfdb7be20fd2417be0615cd2458327fa SHA-256: 0a5e1404f82888f612a087f5ae1ce5a517f74e5081f7087cdadacfdc64529ddd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as PDF files, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for dropping additional payloads or redirecting users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8632782-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8632782-0
  • 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 http://eugeniorivera.com/uploads/1/3/0/5/130540874/130540874.html#exercise+for+aging
    • http://webmail.creativevisionhome.com/uploads/1/3/1/4/131453175/fimugi.pdf
    • http://hostmaster.envirohealthuk.com/uploads/1/3/0/5/130588966/a768de56.pdf
    • http://mta-sts.mail.pjcarradori.com/uploads/1/3/1/0/131070597/xirebot.pdf
    • http://mail.villapavones.com/uploads/1/3/1/3/131398156/2198120.pdf
    • http://bayouzen.org/uploads/1/3/0/8/130874258/4508195.pdf
    • http://kitchenfit.net/uploads/1/3/1/4/131437147/8382557.pdf
    • http://xcadirrigation.com/uploads/1/3/0/7/130775505/3ade1.pdf
    • http://jerrywalker68025.com/uploads/1/3/0/6/130604872/vugoxa-sujipidifu-losanifox.pdf
    • http://mx.elgaby.com/uploads/1/3/1/6/131636707/f2496bb978.pdf
    • http://portal.thecaffeinatedva.com/uploads/1/3/0/8/130874496/5248736.pdf
    • http://carmelomilazzo.com/uploads/1/3/1/3/131379194/40bfd537270c0f.pdf
    • http://casperpharmacy.com/uploads/1/3/0/6/130620320/5822311.pdf
    • http://freshmeat2u.co.uk/uploads/1/3/1/4/131408614/ziwafa-zadisex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mapikupe.files.wordpress.com/2020/06/31411908376.pdf
    • https://nepujonulovu.files.wordpress.com/2020/06/dugomodirobemaziwuk.pdf
    • https://dogapexajok.files.wordpress.com/2020/06/ruramorulatufitikukivefo.pdf
    • https://juwurel.files.wordpress.com/2020/06/55320807734.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cf87.bin
5ed228903e675e07307d5a6ae75d8f764d0505c77686d740b66b7139b858c4d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF87 11960 bytes