Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374f1bd16b0716a…

MALICIOUS

PDF

35.8 KB Created: 2020-06-10 03:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3830c46ac7aae29b1f3f0a3411d586f9 SHA-1: 786598cb61cf77e9e1cdadcadf34070e6e94c90a SHA-256: 1374f1bd16b0716a9626664932e75330bc76be11f89a08c3564d0ace803d249b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. While no scripts were directly extracted, the PDF structure and the sheer volume of external links suggest an attempt to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://erinschnair.com/uploads/1/3/1/4/131438848/131438848.html#apprenez+%25C3%25A0+programmer+en+java+pdf
    • http://k23partsandequipmentllc.com/uploads/1/3/1/0/131070713/701196.pdf
    • http://sadgallery.com/uploads/1/3/0/2/130289218/bc253b53feb01.pdf
    • http://rlegacyclub.com/uploads/1/3/0/5/130590235/7674597.pdf
    • http://webdisk.thogersenfamilyfarm.com/uploads/1/3/0/2/130287445/wodurirava.pdf
    • http://hawkvineyards.com/uploads/1/3/1/3/131384018/zivodasa.pdf
    • http://paytrade.ca/uploads/1/3/0/2/130270985/jolifofiweboveg.pdf
    • http://ronniebratcher.us/uploads/1/3/1/8/131857315/b2340fc.pdf
    • http://webmail.yourhomeandgardenstore.com/uploads/1/3/0/7/130776016/e19df55.pdf
    • http://epapa.org/uploads/1/3/1/3/131381703/badewobi-ruralatafoti-lisujusumu.pdf
    • http://bayanillc.com/uploads/1/3/0/7/130775737/guzafuwaba.pdf
    • http://sundancertradingco.com/uploads/1/3/0/6/130605074/2001612.pdf
    • http://ftp.theshak.com.au/uploads/1/3/0/8/130874496/6948897.pdf
    • http://displayblocking.net/uploads/1/3/0/5/130551239/1048143.pdf
    • http://froehlich-kaltenberg.de/uploads/1/3/1/4/131453657/xanewawomaze-noworofedefikuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kogovabazoro.files.wordpress.com/2020/06/voxefatojexi.pdf
    • https://gorajeg.files.wordpress.com/2020/06/xubenolipovukabekumivarir.pdf
    • https://lusasirogol.files.wordpress.com/2020/06/3127788045.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_off00005a21.bin
f5ae6676a5677932c4adc8168fc28d58e25a78b76997f52c447d0edfb7523fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 12392 bytes