Malicious PDF — malware analysis report

Static analysis result for SHA-256 860b75236c35a93f…

MALICIOUS

PDF

30.3 KB Created: 2020-04-11 02:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a88f98c29c3abbaac1e7aa5fe6feeee9 SHA-1: 439e808b5c46c25e0482e22625d156bca2f6b104 SHA-256: 860b75236c35a93f68bffcd7253b21f814d931ccbbec07d833b5a7504d7f690b
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 are structured as SEO-optimized PDF gateways. The document body, though heavily obfuscated, contains references to 'Modal verbs exercises' and includes URLs that likely lead to further malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users.

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://qmhle.bpmtc.com/uploads/1/3/0/2/130291996/130291996.html#modal+verbs+exercises+bachillerato+with+answers+pdf
    • http://usdcapstonealflen.com/uploads/1/3/0/2/130287847/3e2982a5db9a24.pdf
    • http://west-michigan-drone.com/uploads/1/3/0/9/130969446/gelisejizotekek.pdf
    • http://yogabo.net/uploads/1/3/1/4/131437462/tuwubewolewagalal.pdf
    • http://healthinformationcentre.net/uploads/1/3/1/3/131384414/146092.pdf
    • http://suitelifeonsas.com/uploads/1/3/1/3/131397981/4116380.pdf
    • http://testwebsite.shop/uploads/1/3/0/6/130605165/6785848.pdf
    • http://misscyrarteacher.ca/uploads/1/3/0/8/130874299/7262697.pdf
    • http://fitlifeaudio.com/uploads/1/3/1/4/131406676/6798952.pdf
    • http://2waystreetpolitics.com/uploads/1/3/0/2/130289063/nitavujuwagi.pdf
    • http://njgraniteconstruction.com/uploads/1/3/0/5/130589194/8798122.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_off00004cb4.bin
500a90caad3224aa9362ef02d6dec0cf1bcf300bad7803613be5c319ada15fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB4 7808 bytes

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