Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ecd5399542029…

MALICIOUS

PDF

39.8 KB Created: 2020-03-26 08:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c92f23c836f8e01dbe1376069156b5d7 SHA-1: 9547992461085d5e78c7adf41227a319b38452ea SHA-256: bc7ecd5399542029a1bc8f70e3ad627ad41d009b38643571a821058373f5356b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains the phrase 'Preguntas para hacer una entrevista a profundidad' which may be a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://sun-pave.com/uploads/1/3/0/5/130538902/130538902.html#preguntas+para+hacer+una+entrevista+a+profundidad
    • http://neonmoonart.com/uploads/1/3/0/5/130539227/vaziladojapuk.pdf
    • http://olshefsky.com/uploads/1/3/0/2/130287291/1338847.pdf
    • http://donerboyz.com/uploads/1/3/0/7/130739478/7f6d0a72.pdf
    • http://leighcraft.com/uploads/1/3/0/4/130488851/689450.pdf
    • http://quintepaddlingclub.com/uploads/1/3/0/5/130589308/5e576019fba4.pdf
    • http://yeshua-healing.com/uploads/1/3/0/9/130969521/xerebikimufikox.pdf
    • http://ns1.reliablekitchenservices.com/uploads/1/3/0/8/130874307/gugukilese.pdf
    • http://emilymeklof.com/uploads/1/3/0/7/130739290/2616765.pdf
    • http://www.threedmarketingsolutions.com/uploads/1/3/0/3/130323754/2975318.pdf
    • http://mosquitobrf.org/uploads/1/3/0/2/130287883/fb7f9bad7.pdf
    • http://chubbiebunniesbows.com/uploads/1/3/0/3/130379549/giwabutuzuz-lexotomaxasijar-xiwane.pdf
    • http://insideoutkitchenandbath.com/uploads/1/3/0/4/130436074/fevudazusajite_mupap_ruwuvexilomofok_xudisik.pdf
    • http://jaastransportesyservicios.com/uploads/1/3/1/1/131164486/9906027.pdf
    • http://tehditistihbarat.org/uploads/1/3/0/2/130271161/mapuladimob.pdf
    • http://rudynts.com/uploads/1/3/0/6/130620750/xowixunarawatelurum.pdf
    • http://industrialelectricalservices.net/uploads/1/3/0/5/130541445/81f7bfcf3.pdf
    • http://earthwarriorsfestival.com/uploads/1/3/0/6/130620159/zubum-suzokum-dadipokeguz-rawowawowatus.pdf
    • http://pushthenote.com/uploads/1/3/0/5/130539820/kesisijajonarog.pdf
    • http://terminal3.net/uploads/1/3/0/5/130590361/bunojeradegadegumixo.pdf
    • http://kevingriffithsart.com/uploads/1/3/0/5/130550778/439efc8b08bbee8.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743c.bin
949da07f521d5f1138abd1acd4f3ef59cb69f045ec8ffd877022d4e9e851cefe
pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 7344 bytes