Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aebec6a54f6402b…

MALICIOUS

PDF

37.1 KB Created: 2020-06-02 12:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88dd29db6148c1e9ac0671503a9a42a4 SHA-1: 6bb681a184f8c9d8740d394ecbf8e86c8263375a SHA-256: 0aebec6a54f6402b116ff09e0a2bd1fe1ae3cda2267e4860850da4e0fdb344a2
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with the primary one being http://74-123-77-13.mgwnet.com/uploads/1/3/0/7/130739536/130739536.html#hollander+interchange+manual, presented as a manual to entice users to click. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://74-123-77-13.mgwnet.com/uploads/1/3/0/7/130739536/130739536.html#hollander+interchange+manual
    • http://changingstep.com/uploads/1/3/0/2/130289392/4bbac39262bfcb0.pdf
    • http://gmtreats.com/uploads/1/3/0/9/130969322/771294.pdf
    • http://powerfulthinking.org/uploads/1/3/0/7/130739251/7419646.pdf
    • http://kellybunn.com/uploads/1/3/0/5/130589171/fogipo-gilizigupujax-dobinuwinu-kezegosijokemu.pdf
    • http://auburncitizens4schools.com/uploads/1/3/0/6/130603930/8077765.pdf
    • http://casualkids.net/uploads/1/3/1/4/131453214/c967c9c467.pdf
    • http://infinitydatasol.com/uploads/1/3/1/4/131454219/saluguzojaferaje.pdf
    • http://teambethfoundation.org/uploads/1/3/0/3/130323249/xabijojelozew_xarufobodavas_bikil_xarijumom.pdf
    • http://74-123-77-13.mgwnet.com/uploads/1/3/0/7/130739536/terms.html
    • http://74-123-77-13.mgwnet.com/uploads/1/3/0/7/130739536/dmca.html
    • http://74-123-77-13.mgwnet.com/uploads/1/3/0/7/130739536/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lanternfolkca.previews.rebel.com/uploads/1/3/0/4/130476200/2c0835.pdf
    • https://xoxijukixife.files.wordpress.com/2020/05/47509652524.pdf
    • https://wujujozimuse.files.wordpress.com/2020/05/tijej.pdf
    • https://zibebuti.files.wordpress.com/2020/05/maxiledo.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_off000064fa.bin
9ec4f764f4830bdf386599ab668daec071b865921015302ff1b00e2e8886bb66
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 10584 bytes