Malicious PDF — malware analysis report

Static analysis result for SHA-256 04843afab7a889f9…

MALICIOUS

PDF

48.7 KB Created: 2020-03-10 07:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9c02b3e35ce22253cec55cdda05ee225 SHA-1: e73f7974a7c6af2def6afa77085684436e2e3d4d SHA-256: 04843afab7a889f94bba1f7dd09db5ce2330992849a27ef2a8fe0125167ec8a2
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs points towards a potential phishing or malware distribution vector. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://74-123-72-35.mgwnet.com/uploads/1/3/0/5/130588527/130588527.html#formula+of+combined+geometric+mean
    • http://www.cherrieswear.shop/uploads/1/3/0/7/130776415/sivusawijevuruxaneba.pdf
    • http://dinnerandacupcake.com/uploads/1/3/0/5/130590111/e97f0a05a937820.pdf
    • http://evanryanstern.com/uploads/1/3/0/2/130289746/vekuze.pdf
    • http://pcaregionalconference2019.com/uploads/1/3/0/7/130740438/0f96da3fbd0ab.pdf
    • http://johnscreekyouthadvocates.org/uploads/1/3/0/5/130590677/tudupeluje-jexoranagupade-jaxupawenep-rarela.pdf
    • http://camelliacustoms.com/uploads/1/3/0/6/130621030/65bcc5.pdf
    • http://millenniallust.com/uploads/1/3/0/7/130776611/vatoze.pdf
    • http://donna-spirituallifecoach.com/uploads/1/3/0/8/130873717/7828177.pdf
    • http://garrettgroupusa.com/uploads/1/3/0/7/130775854/nerofiput-ligudam-berozaf.pdf
    • http://lamaralexanderforsenate.com/uploads/1/3/0/2/130270843/durewaropu.pdf
    • http://www.cassieorduno.com/uploads/1/3/0/6/130620154/suxopo-buxurok-fesatotagifenu.pdf
    • http://mixedsf.com/uploads/1/3/1/0/131071252/8572fc587fb.pdf
    • http://www.aromakandies.com/uploads/1/3/0/7/130775911/8775453.pdf
    • http://halobook.com/uploads/1/3/0/3/130379912/28f1adc6fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb6.bin
1cb8c7aa3926b118da542bafddc51e772f41d3220800b315a6efbfa38f19c7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB6 9840 bytes
font_01_sfnt_off000094f3.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x94F3 2788 bytes
font_02_sfnt_off00009ec1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC1 16036 bytes