Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f4218b7f9fd8cd…

MALICIOUS

PDF

38.1 KB Created: 2020-03-29 10:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 250959f9a190e484ae97bafa39dcb282 SHA-1: 37c7a4603452384d3c7c7a82f7df1e5d98f413ba SHA-256: 78f4218b7f9fd8cd0ed579a3290a0fe9b7cd98001e98d85ea75291c38ce573ac
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which follow a pattern suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the embedded URLs point to suspicious domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to lead the user to a compromised or malicious website, potentially for phishing or further malware delivery.

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://hall-elopement.rominastiebenphotography.com/uploads/1/3/1/3/131384403/131384403.html#examen+muestra+unam+2018+pdf+area+3
    • http://issybooks.com/uploads/1/3/0/7/130738679/1841e6.pdf
    • http://greensborocleancarpets.com/uploads/1/3/0/6/130604359/zokufeboxuduximagi.pdf
    • http://www.slsuperior.com/uploads/1/3/0/3/130379336/befde1a4.pdf
    • http://webdisk.legitimatemarry.com/uploads/1/3/0/7/130775130/8384230.pdf
    • http://mta-sts.mx.livbeauty.net/uploads/1/3/0/5/130589033/7248839.pdf
    • http://restar.agency/uploads/1/3/0/6/130621985/9c72764f9234.pdf
    • http://mystaybuddy.com/uploads/1/3/0/5/130589140/bapirelebowuloleku.pdf
    • http://www.leusia.com/uploads/1/3/0/7/130776221/6345836.pdf
    • http://elizabethgaul.com/uploads/1/3/0/2/130289629/bde6f1.pdf
    • http://zhangxiaoyan.info/uploads/1/3/0/6/130620464/xetalunubafuvot_gutiwusawa_wifim_paruwesetuxox.pdf
    • http://littlehungryiris.com/uploads/1/3/0/3/130323253/1694135.pdf
    • http://tomorrowlogy.com/uploads/1/3/0/7/130739750/negojanuzunoto.pdf
    • http://www.swimwearsurvey.com/uploads/1/3/0/8/130815228/fifuvuza-sirufiki-sexirupe-mivebavaji.pdf
    • http://tenderheartsllc.com/uploads/1/3/0/4/130435781/gisamibal.pdf
    • http://sdesworks.org/uploads/1/3/0/3/130323462/ce991c638c.pdf
    • http://newmarlboroughfiber.org/uploads/1/3/0/2/130271051/2034186.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_off00006ac9.bin
508b2ca1e04fe51e3419297d6046e6170cc379ef56bc89fc9707a8b4050373fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC9 8868 bytes