Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6cc32d66a50e23…

MALICIOUS

PDF

60.6 KB Created: 2020-03-11 07:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36d1664eca347a82679f5d0d831659c7 SHA-1: fc665d9aef8f6ba2843db765ce6d12f4522d3ce8 SHA-256: 6a6cc32d66a50e232787f713ca90a3bb4eb2b6dafff69ccf2131bc533dfebf38
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic. One of these links, "http://74-123-75-191.mgwnet.com/uploads/1/3/0/6/130639539/130639539.html#hypersensitivity+pneumonitis+prognosis", is directly embedded in the document body. The presence of numerous external links suggests an attempt to redirect users to potentially malicious websites, possibly for SEO spam or to host further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://74-123-75-191.mgwnet.com/uploads/1/3/0/6/130639539/130639539.html#hypersensitivity+pneumonitis+prognosis
    • http://www.welovemolly.com/uploads/1/3/0/8/130874509/dofudotipa_tosasoganaz_zamosanim.pdf
    • http://mysimplyonlyshawlsscotland.co.uk/uploads/1/3/0/7/130776533/9060118.pdf
    • http://qsdecks.com/uploads/1/3/0/6/130639854/1520363.pdf
    • http://eaglecustompaintandbody.com/uploads/1/3/0/3/130313230/rosela.pdf
    • http://chandalinchamplin.net/uploads/1/3/0/7/130738831/bixozovit.pdf
    • http://mohamoudegal.com/uploads/1/3/0/5/130550652/3210973.pdf
    • http://mail.skylinerefrigeration.com/uploads/1/3/0/2/130270923/185096.pdf
    • http://uncwgreeks.com/uploads/1/3/0/5/130544413/9543903.pdf
    • http://www.k9playtimestore.com.au/uploads/1/3/0/6/130620176/radidi_dizirud_kubujakadab_jiwuge.pdf
    • http://www.kuantanwolf.com/uploads/1/3/0/4/130476429/vinuxifa-befubew-perezugureroveb-bojedonoxine.pdf
    • http://topnotchtscrubs.com/uploads/1/3/0/7/130740297/24e9475b3a1.pdf
    • http://rationalshift.com/uploads/1/3/0/2/130272512/1813906.pdf
    • http://resurfacetechnology.com/uploads/1/3/0/5/130588478/9204775.pdf
    • http://bathroomfitter.org.uk/uploads/1/3/0/3/130323693/33832b1f2da.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab57.bin
504c5d0b794a0da5e310f0c3205fe53b865c5c0181a9f851dbfaa42988d06965
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB57 10264 bytes
font_01_sfnt_off0000cf02.bin
61ca593122bdf9f8d2de89784c713a2b278bdd5b054eff5a59c50fd3ef05b3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16148 bytes