Malicious PDF — malware analysis report

Static analysis result for SHA-256 de634971381a824f…

MALICIOUS

PDF

46.5 KB Created: 2020-04-11 09:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 321eb912c1de137ccb417d715b7ce4c6 SHA-1: 3df72ac32873aa04640db370424ba8387daaf610 SHA-256: de634971381a824fc9d76b0c1803503579dbac36addff723469c6f5fa8f89810
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm used for SEO manipulation. The ML classifier strongly indicated maliciousness. The embedded document body text is heavily obfuscated and does not provide clear user-facing content, but the presence of numerous links to various domains suggests a malicious intent to redirect users. No scripts were extracted from this sample.

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://humannaturefoundation.com/uploads/1/3/0/4/130435807/130435807.html#sony+vpl+hw10
    • http://evergreen-memorials.com/uploads/1/3/0/2/130271209/kufaza-foxenawivisa-pokexiku-vipenu.pdf
    • http://theblockhousecafe.com/uploads/1/3/1/6/131607683/5254408.pdf
    • http://alamomidcentury.com/uploads/1/3/1/0/131070149/fadaranozifijaf.pdf
    • http://maayancollective.org/uploads/1/3/0/4/130483990/6634703.pdf
    • http://3800southcicero.com/uploads/1/3/0/7/130739098/fudenalotipawa-retate-rezajabedulot-notix.pdf
    • http://dryraintravel.com/uploads/1/3/0/9/130969198/4822746.pdf
    • http://rosiemcburney.com/uploads/1/3/1/3/131379395/e5157046a579.pdf
    • http://binoracle.com/uploads/1/3/1/4/131406435/bc67ae26a2.pdf
    • http://cowinfo.org/uploads/1/3/0/5/130589264/654513.pdf
    • http://josephpvusich.com/uploads/1/3/1/4/131438337/nobefali.pdf
    • http://joybangkokholiday.com/uploads/1/3/1/4/131483421/polegufesipe.pdf
    • http://stjohnbaptistdelasalle.com/uploads/1/3/1/0/131069915/6e8baa.pdf
    • http://heatherweddings.com/uploads/1/3/1/3/131398559/kolor.pdf
    • http://galroga.com/uploads/1/3/0/2/130289317/foxunime_tupilifike_jixit.pdf
    • http://joybangkokholid
    • 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_off00008b72.bin
9e756cb1a509605ba593547fbe417dfe7a0e4270556ce1db2485c53cad1e5063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 8712 bytes

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