Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0758d335dbe821…

MALICIOUS

PDF

40.7 KB Created: 2020-04-01 20:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f264e058694bb05163bd686de0f976f SHA-1: b39c8bf5ca535e728fe3148b88683e25e6988676 SHA-256: 3a0758d335dbe821b597f40a499d5030855186ac7e5870287c4d0c49717ca563
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains a reference to calculating percentages in Excel, which is likely a lure to disguise the malicious intent of directing users to a link farm. The primary goal appears to be SEO manipulation or distributing further malicious content through these numerous links.

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://skygridstudio.com/uploads/1/3/0/6/130603721/130603721.html#como+calcular+porcentajes+en+excel+formula
    • http://jen-velez.info/uploads/1/3/0/9/130969813/627483.pdf
    • http://lemoniteboutique.com/uploads/1/3/1/4/131454389/wepewawoxa.pdf
    • http://annpiquette.com/uploads/1/3/0/2/130270746/1706982.pdf
    • http://jaymichaelgilman.com/uploads/1/3/0/6/130604086/rufeserojimu.pdf
    • http://messyjamstudios.com/uploads/1/3/0/7/130739654/8292552.pdf
    • http://powerbeadbracelet.com/uploads/1/3/0/6/130604606/rawewexu_tovaxopexek.pdf
    • http://godskingdomchurch.net/uploads/1/3/0/3/130323219/8113416.pdf
    • http://katerri.com/uploads/1/3/1/4/131409717/mufiponol.pdf
    • http://taxdestinypa.com/uploads/1/3/0/4/130476327/xizusimanejeg.pdf
    • http://johnthomsbehaviormethod.com/uploads/1/3/0/6/130621111/869721.pdf
    • http://oakscorp.com/uploads/1/3/0/5/130550955/genusit.pdf
    • http://getmyproblemsolved.com/uploads/1/3/0/5/130541272/konase_nozisam.pdf
    • http://platinummemorial.com/uploads/1/3/1/3/131380582/2236476.pdf
    • http://kimberlyahogan.com/uploads/1/3/0/7/130739131/malejotax-wiwojazojutiden.pdf
    • http://urbanmotions.com/uploads/1/3/0/4/130488445/jinogumoteteroj.pdf
    • http://neugewonnenerottweilers.ca/uploads/1/3/0/7/130739093/a8caa.pdf
    • http://southwestwbn.com/uploads/1/3/0/4/130435753/2142824.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007303.bin
1b3979ff77ced0de4713be6eaeff4a8cba24ef6ae6526fba035c1e3d7e7c969f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 8936 bytes

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