Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb79da0e0b9c516c…

MALICIOUS

PDF

40.6 KB Created: 2020-06-04 09:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97bdc6393bb0873faeaff9c0a3216720 SHA-1: 67288fa513f8dd973615d54aca3f36be454d6054 SHA-256: fb79da0e0b9c516c5a555c9cb3576c4a81a5f83928a6ba63e96b05bd3201015a
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a large number of external links hosted on various domains. The ML classifier also strongly suggests maliciousness. No scripts were extracted, and the document body was heavily truncated, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://yvzsr.bpmtc.com/uploads/1/3/0/7/130775685/130775685.html#build+a+bra+online
    • http://nolimitationsyouthservices.org/uploads/1/3/0/6/130639298/e9611b3ef98c1b.pdf
    • http://clarksurveyor.com/uploads/1/3/0/5/130544437/ba3b3038.pdf
    • http://afiaschwarzenegger.com/uploads/1/3/1/0/131071231/3048667.pdf
    • http://disabilityandsocialchange.com/uploads/1/3/0/4/130488091/9527798.pdf
    • http://skybluedigitalsolutions.com/uploads/1/3/0/7/130776571/925755.pdf
    • http://cardcoctions.com/uploads/1/3/1/3/131384255/eabe1f4409e59.pdf
    • http://hostmaster.thefoodproject.co.uk/uploads/1/3/0/8/130814584/8032118.pdf
    • http://angievourtsi.com/uploads/1/3/0/8/130814534/35229022119d.pdf
    • http://yvzsr.bpmtc.com/uploads/1/3/0/7/130775685/terms.html
    • http://yvzsr.bpmtc.com/uploads/1/3/0/7/130775685/dmca.html
    • http://yvzsr.bpmtc.com/uploads/1/3/0/7/130775685/policy.html
    • http://hostmaster.thefoodproject.co.uk/uploads/1/3/0/8/130
    • https://lesimil.files.wordpress.com/2020/06/78848072081.pdf
    • https://waluvemoxus.files.wordpress.com/2020/06/boxuxunugugav.pdf
    • https://mixanutiliba590569985.files.wordpress.com/2020/06/rudabajapaxel.pdf
    • https://zilififim.files.wordpress.com/2020/06/kumekojupakewi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000696f.bin
7b4a49995b7dd69d4afe5ee3eee77951727d25d484e62cc4016f8f5b91e0b297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696F 2900 bytes
font_01_sfnt_off000073bc.bin
4f98a6c39e54e5d17b747248c0ecaee6ab2176a75af3d43e3bcbdb1b90e056b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BC 10204 bytes

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