Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a071625ada6df7…

MALICIOUS

PDF

38.6 KB Created: 2020-04-01 11:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 248dc9d69498e0bb256f2ba2775a81fa SHA-1: 9bca675ea9854ab646e8be8d444ee6caae982a1e SHA-256: 56a071625ada6df71db15b2c607452a01490a593448745e11424c546efbe215f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files. The document body text, though garbled, appears to be related to accounting, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious activity. The primary attack pattern involves redirecting users to a network of suspicious URLs.

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://interiorartifacts.org/uploads/1/3/0/6/130640044/130640044.html#administracion+de+costos+contabilidad+y+control+hansen+mowen+quinta+edicion
    • http://hayagroupinc.com/uploads/1/3/0/3/130313466/zuvaxaroge.pdf
    • http://x2lfitness.com/uploads/1/3/0/5/130544078/7453374.pdf
    • http://prizinofzin.com/uploads/1/3/0/2/130291696/dokejivu-vipafiji-mutekawagag-vowazele.pdf
    • http://preferredpdr.com/uploads/1/3/0/8/130814241/manobepakojoden.pdf
    • http://pecosservicing.com/uploads/1/3/0/6/130604340/zalimimarituduro.pdf
    • http://gcphysicianadvisors.com/uploads/1/3/0/6/130639551/bepuvemaveped-wefijaviw-wepofosikavel.pdf
    • http://10komobile.net/uploads/1/3/0/5/130551782/vobigekosomukef-vamunotamumaj.pdf
    • http://howtowinsuccess.com/uploads/1/3/1/0/131069970/laseguk.pdf
    • http://melodyscustomcreationsalabama.com/uploads/1/3/0/6/130640159/5138676.pdf
    • http://yourscrivenerpress.com/uploads/1/3/0/5/130588783/fejokezal.pdf
    • http://comstar.pl/uploads/1/3/0/2/130271111/e30829bdbdf229.pdf
    • http://skunkriverrevival.com/uploads/1/3/0/9/130969712/kotejoverat_jewowiwamotem.pdf
    • http://zoyanudelman-portfolio.com/uploads/1/3/0/2/130291635/54062387790.pdf
    • http://heuristicdata.net/uploads/1/3/0/5/130589373/niwukixepuloxovi.pdf
    • http://mytinyhome.net/uploads/1/3/0/2/130273610/3e093f.pdf
    • http://acaciaroadventures.com/uploads/1/3/0/2/130287852/wekapi_pudawarujikozot.pdf
    • http://graft.foundation/uploads/1/3/0/6/130604667/9345638.pdf
    • http://kclsprodevelopment.com/uploads/1/3/0/2/130270845/7348335.pdf
    • http://www.peabodyyouthfootballandcheer.com/uploads/1/3/0/9/130968925/xotabusivofenogekad.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_off00006dbc.bin
2f26ab33f00c32f4e61ba77e9849eaf036882be97b5d7eb75be45d9870acfaaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBC 8244 bytes